MATH 225N Week 5 Assignment: Central Limit Theorem for Proportions

1. Question: A dental student is conducting a study on the number of people who visit their dentist regularly. Of the 520 people surveyed, 312 indicated that they had visited their dentist within the past year. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=60.
2. Question: From recent census data, it is discovered that the proportion of the adults in the United States who are first generation Americans is 14%.  For a random sample of size 500, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?
3. Question: From recent survey data, a car buying business finds that 5% of the proportion of adults in a city would be likely to use their services. For a random sample of 115 people, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?
4. Question: From recent survey data, its known that the proportion of adults in the United States who are smokers is 18%. For a random sample of size 150, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?
5. Question: A small community college has a population of 986students, 252 of whom them are considered non-traditional students.
6. Question: A marketing team is targeting people who might buy a hybrid car. In their city, with a population of 30,000 people, 3,170 people either drive a hybrid car or have indicated on a recent survey that they would be interested in driving one. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=121.
7. Question: A brokerage company is analyzing its retirement accounts for its clients nearing retirement. From recent survey data, the proportion of adults in the United States who say they are financially ready for retirement is 31%. For a random sample of size 85, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?
8. Question: Given the plot of normal distributions A and B below, which of the following statements is true? Select all correct answers…. B has the larger mean…… A has the larger standard deviation.
9. Question: Given the plot of normal distributions A and B below, which of the following statements is true? Select all correct answers….. The means of A and B are equal….. A has the larger standard deviation.
10. Question: The graph below shows the graphs of several normal distributions, labeled A, B, and C, on the same axis. Determine which normal distribution has the largest standard deviation.
11. Question: Given the plot of normal distributions A and B below, which of the following statements is true? Select all correct answers….. B has the larger mean….. A has the larger standard deviation.
12. Question: The graph below shows the graphs of several normal distributions, labeled A, B, and C, on the same axis. Determine which normal distribution has the largest mean…… Remember that the mean of a normal distribution is the x-value of its central point (the top of the “hill”). Therefore, a distribution with a larger mean will be centered farther to the right than a distribution with a smaller mean.
13. Question: Which of the data sets represented by the following histograms has the smallest standard deviation?…. An untitled histogram has a horizontal axis labeled from 0 to 150 in increments of 50 and vertical axis labeled from 0 to 140 in increments of 20. The histogram contains vertical bars of width 6, starting at the horizontal axis value of 75. The approximate heights of the bars as follows, where the horizontal axis label is listed first and the approximate height is listed second: 75, 6; 82, 18; 88, 70; 76, 115; 82, 150; 88, 103; 95, 70; 102, 20; 108, 8.
14. Question: Which of the data sets represented by the following box and whisker plots has the smallest standard deviation?
15. Question: Suppose that you are conducting a survey on how many pets each employee has in his or her household. The mean number of pets is 4per household, and the standard deviation is 2. Rob only owns cats, and he has 10 (Which of the following statements is true?)…… The number of pets owned by Rob is 3 standard deviations to the right of the mean.          If the number of pets owned by Rob is 6 standard deviations to the right of the mean, then Rob should have 4+6×2=16  pets.
16. Question: A math instructor is teaching an algebra course, statistics course and calculus course……. After the final exams are completed the instructor would like to know which class had most consistent scores on the final exam and which class had the greatest variation in scores on the final exam….. The results from the final exam for these three classes are shown below:…. Based on these results, which class had most consistent scores on the final exam and which class had the greatest variation in scores on the final exam.
17. Question: Which of the data sets represented by the following box and whisker plots has the smallest standard deviation?
18. Question: Which of the following lists of data has the largest standard deviation?
19. Question: Which of the following lists of data has the largest standard deviation?…. 24, 15, 21, 23, 9, 22, 12, 21, 20, 13
20. Question: The graph below shows the graphs of several normal distributions, labeled A, B, and C, on the same axis. Determine which normal distribution has the largest mean
21. Question: Given the plot of normal distributions A and B below, which of the following statements is true? Select all correct answers….. A figure consists of two curves labeled Upper A and Upper B. Curve Upper A is evenly spread out from the center, and curve Upper B is farther to the right than A and more evenly spread out.
22. Question: The graph below shows the graphs of several normal distributions, labeled A, B, and C, on the same axis. Determine which normal distribution has the smallest standard deviation.
23. Question: An obstetrician is researching postpartum programs for new mothers. From recent census data, it is known that the proportion of women in the United States who are of child bearing age is 17%. For a random sample of size 250, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?
24. Question: A youth director for a city’s parks and recreations department is planning for next year’s program. From a a survey of city residents, the director knows that 35% of the population participate in the parks and recreations programs. For a random sample of 40 people, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?
25. Question: From recent survey data, its known that the proportion of adults in the United States who are smokers is 18%. For a random sample of size 150, what is standard deviation for the sampling distribution of the sample proportions.
26. Question: A small community college has a population of 986students, 252 of whom them are considered non-traditional students….. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=40.
27. Question: Economists are analyzing the effects of new tax policies on population growth. From recent census data, it is known that the proportion of families in the United States who have more than 3 children in the household is 26%. For a random sample of 50 families, what is the standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?Given the population proportion p=26%=0.26 and a sample size of n=50, the standard deviation of the sampling distribution of sample proportions is
28. Question: Of the 459,000 people living in Miami, 68%indicated on a recent, city-wide survey that they were employed . For a random sample of size 490 people, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?Given the population proportion p=68%=0.68 and a sample size of n=490, the standard deviation of the sampling distribution of sample proportions is
29. Question: The graph below shows the graphs of several normal distributions, labeled A, B, and C, on the same axis. Determine which normal distribution has the smallest mean…… A curve labeled A rises to a maximum near the left of the horizontal axis and falls, a curve labeled B rises to a maximum near the right of the horizontal axis and falls, a curve labeled C rises to a maximum near the center of the horizontal axis and falls.
30. Question: A credit card company surveys its customers to determine the number of times they use the card each month. There are 5,500 customers and 2,756 indicate that they use the card at least twice each month. …. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=70
31. Question: A horse racing track knows that the proportion of its gamblers that report winning is 15%. For a random sample of 64 gamblers, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places? Given the population proportion p=15%=0.15 and a sample size of n=64, the standard deviation of the sampling distribution of sample proportions is
32. Question: Of the 13,500 savings accounts in a bank, 4,675 belong to people younger than 40 years old. The bank president would like to increase her institution’s marketing strategy to younger customers, so she is examining the population proportions in order to create a statistical study….. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=400.
33. Question: A baseball team calls itself “America’s Favorite Team,” because it has 90,000 fans on social media out of 2,210,000 social media users….. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=1,000.
34. Question: A study by doctors of children attending a certain elementary school finds that, of 812 students, 245 watch more than 2 hours of television each day. …. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=100 students
35. Question: Pharmacy technicians are concerned about the rising number of fraudulent prescriptions they are seeing. A small pharmacy sees 1,500 new prescriptions a month, 28 of which are fraudulent…. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=180
36. Question: A dental student is conducting a study on the number of people who visit their dentist regularly. Of the 520 people surveyed, 312 indicated that they had visited their dentist within the past year….. Find the population proportion, as well as the mean and standard deviation of the sampling distribution for samples of size n=60.
37. Question: From recent survey data, its known that the proportion of adults in the United States who are smokers is 18%. For a random sample of size 150, what is standard deviation for the sampling distribution of the sample proportions, rounded to three decimal places?

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