The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke (CDC website, December 14, 2014). Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .32. a. How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02 (rounded up to the next whole number)? Use 95% confidence. b. Assume that the study uses your sample size recommendation in part (a) and finds 520 smokers. What is the point estimate of the proportion of smokers in the population (to 4 decimals)? c. What is the 95% confidence interval for the proportion of smokers in the population (to 4 decimals)?

Q: Census Bureau report on the income of Americans says that with 90% confidence the median income of…

A: It is provided that, Census Bureau report on the income of Americans says that with 90% confidence…

Q: A sample of 71 college students yields a mean annual income of $3595. Assuming that the population…

A:

Q: Choose a quantitative variable out of any dataset and construct its FDT. Comment on its…

A: Let's consider the "total bill" column in a restaurant's datasets as the quantitative variable. The…

Q: The Bureau of Alcohol, Tobacco, and Firearms (BATF) has been concerned about lead levels in…

A: GivenLead levels rangin from 47 to 660Minimum value = 47Maximum value = 660Margin of…

Q: A Seattle consumer agency believes that plumbers’ rates are too high and wants to estimate the mean…

A: GivenConfidence Interval(c)=95%Margin of Error(E)=3%=0.03Let…

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A: Given: n=28 standard deviation s = $5 confidence level = 98%

Q: Suppose that you have a large dataset (from 10,000 family members) regarding visits to the zoo. The…

A: Option D. Mean is the correct answer

Q: A recommendation for the amount of vitamin C that a person should have per day is 75 mg. A…

A: given that

Q: In a survey, 13 people were asked how much they spent on their child's last birthday gift. The…

A: The result of the survey is roughly bell-shaped. So, we assume that the population is approximately…

Q: A newspaper infographic titled "Have a Nice Trip" summarized data from a survey of 1,000 U.S. adults…

A: The objective of the question is to estimate the population proportion of U.S. adults who have…

Q: In a survey, 30 people were asked how much they spent on their child's last birthday gift. The…

A: given data,  bell- shaped distributionμ=33σ=2n=30CI=0.99α=1-0.99=0.01 margin of error for the data=?

Q: he mean height of all adult American males is 69 inches (5 ft 9 in). A researcher wonders if young…

A: a) The hypothesized mean is 69 inches.

Q: The Congressional Budget Office reports that 36% of federal civilian employees have a bachelor's…

A: Note:Thank you for posting the question! Since your question has more than 3 parts, we have solved…

Q: A nutritionist seeks to conduct a clinical trial on the effects of eating papaya on cholesterol…

A: Answer D. What is the minimum number of people I need for the study?

Q: How large a sample is necessary to estimate the true proportion of unmarried Canadians aged 25-29…

A: Given data: Margin of error  = 5% = 0.05 Confidence level  = 0.90 To find: Sample size (n) = ?

Q: In a survey, 20 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: The Bureau of Alcohol, Tobacco, and Firearms (BATF) has been concerned about lead levels in…

A: Given, Range = 49 to 720 Margin of Error E = 10 at 90% confidence level  α = 0.1Critical value Zα2 =…

Q: Consider a dataset with standard deviation 2, mean 6.2, and a total of 186 data points. What is the…

A: The given data is - Standard deviation (σ)=2 Mean(x)=6.2 Sample size(n)=186

Q: In a survey, 24 people were asked how much they spent on their child's last birthday gift. The…

A: The sample size is n=24 mean is =39 the standard deviation is =3.The confidence level is 95%, then…

Q: Past studies have indicated that the percentage of smokers was estimated to be about 34%. Given the…

A: Given,Past studies have indicated that the percentage of smokers was estimated to be about 34%. That…

Q: You want to create a Z-interval for a population mean, using table C, with the following…

A: From the provided information, Sample size (n) = 25 Mean (x̅) = 34.2 Population standard deviation…

Q: The current government economic survey wishes to know, with 96% confidence, the average household…

A:

Q: The mean cost of a meal for two in a mid-range restaurant in Tokyo is $40 (Numbeo.com website,…

A: Given the mean cost of a mean for two in mid- range restaurant in tokyo is $40.The data for cost of…

Q: In a survey, 20 people were asked how much they spent on their child's last birthday gift. The…

A: Given that  Sample size n =20 Sample mean=37 Standard deviation =7

Q: In a survey, 12 people were asked how much they spent on their child's last birthday gift. The…

A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…

Q: Internet sites often vanish or move, so that references to them can’t be followed. In fact, 13% of…

A: Given data: Probability  = 0.13 Sample size  = 7 To calculate: what is the probability that at least…

Q: The Sum of Squared Errors for a data set of 18 numbers is 64. What is the standard deviation?

A: Given thatThe sum of squared errors of data set (SS) = 64Number of data values in data set (n) =…

Q: In a survey, 30 people were asked how much they spent on their child's last birthday gift. The…

A: Given ,Sample size n = 30Sample mean x = 36Sample standard deviation (s0 =2d.F = n-1dF = 30-1 =…

Q: a survey, 16 people were asked how much they spent on their child's last birthday gift. The results…

A:

Q: An article in the San Jose Mercury Newsstated that students in the California state university…

A:

Q: In a survey, 10 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 21 people were asked how much they spent on their child's last birthday gift. The…

A: Givensample size(n)=21Mean(x)=34standard deviation(s)=6confidence level=80%

Q: The mean age for licensed physicians in the United States is 51.5 years. A government official…

A:

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.