Check My Work 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.30. a. How arge a sample should be taken to estimate the proportion of smokers in the population with a margin of error of 2 to the nearest whole number use 95% confidence つ! b. Assume that the study uses your sample size recommendation in part (a) and finds 520 smokers. What is the point estimate of the prop o \ decimals)? c. What is the 95% confidence interval for the proportion of smokers in the popula tion (to 4 decimals)

Q: A union of restaurant and foodservice workers would like to estimate this year's mean hourly wage u…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: Researchers conducting a study of 15 children with a diagnosis of ADHD wish to assess whether the…

A: The BMI of 15 children is given.

Q: c. Find the p-value. Round to 4 decimals. p-value = d. Make a decision. O Fail to reject the null…

A: Given : Mean : x1 = 46.9x2 = 36.2 standard deviation : σ1 = 12.4σ2 = 15.3 Sample size : n1 = 124n2 =…

Q: Listed below are the blood pressure measurements taken from the right and left arm of 5 patients.…

A: From the provided information, The mean and standard deviation of the right arm data can be obtained…

Q: The Centers for Disease Control reported the percentage of people 18 years of age and older who…

A: a) The sample size can be estimated as follows: n=ze2p(1-p)where, z = z scoree = errorp =…

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: 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: In a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: You measure 44 textbook's weights, and find they have a mean weight of 81 ounces. Assume the…

A: Answer: From the given data, Sample size(n) = 44 Mean (x¯) = 81 Standard deviation (σ) = 3.8 95%…

Q: What is the formula for a deviation score from a population?

A: Formula :

Q: Between what two values of Z (symmetrically distributed around the mean) will 95.44% of all possible…

A:

Q: Which kind of descriptive statistics can be included to summarize the quantitative data? if the…

A:

Q: 2. I want to create a confidence interval for the salaries of statistics teachers in America. I want…

A:

Q: In 2009, it was estimated that 63% of Americans supported the death penalty. In 2014, a Rasmussen…

A: sample size(n)=943 No. of Americans supported the death penalty(x)=536 population proportion=0.63

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: Psychological and educational tests, including MMPI are often designed so they have a mean of 50 and…

A: Given: Mean μ=50 Standard deviation σ=10

Q: A random sample of 1005 US adults were asked whether nuclear weapons owned by the US made them feel…

A: We have given that,  Favorable cases (X) = 543 and sample size    (N) = 1005  Then,  We will find…

Q: 71 S4 4 Aphilantvopic organization knows that s donors have an average age near 60 and is…

A:

Q: Find the population proportion? find the margin of e? construct confidence interval ?

A:

Q: The 40-hour work week is considered the standard in American society today. Imagine you wish to use…

A: The t-statistic is generally higher than the z-statistic at smaller degrees of freedom, i.e. at…

Q: In a poll, 1200 adults in a region were asked about their online vs. in-store clothes shopping. One…

A: Answer:- Given, Sample size, n = 1200  Sample proportion, p = 38% = 0.38  Confidence level = 95% =…

Q: For 100 randomly selected adults, compute the mean and standard deviation?

A: A recent poll found that 47% of adults believe that the overall state of moral values is poor.Here…

Q: When 290 college students are randomly surveyed, it is found that 120 own a car. Find a 99%…

A: Given that, x=120,n=290 The sample proportion is, Critical values: By using the standard normal…

Q: The article "The Average American Is in Credit Card Debt, No Matter the Economy"† states that in…

A: Note: Hi there! Thank you for posting the question. As your question has more than 3 parts, we have…

Q: mandatory competency test for high school sophomores has a normal distribution with a mean of 329…

A:

Q: 2. Construct a 95% confidence interval to estimate the proportion of Wingate female students that…

A: total number of female students =181 number of students who are left handed=15

Q: To assess the proportion of the readers of a magazine being professional, a random sample of 1000…

A: Given that the random sample of 1000 readers is selected and 660 are found to be professionals. That…

Q: whites surveyed, the mean life span was 49 years with a standard deviation of 12.1 nonwhites, the…

A:

Q: the grouped data?

A:

Q: What is the confidence interval? Select the correct choice below and, if necessary, fill in the…

A: Mean = 56.64 Standard deviation = 14.598 n=100

Q: In the case of research data analysis which one is the best? SD (standard deviation)  or ANOVA?

A: Statistical methods involve  planning, designing, collection of data, analyzing the data,…

Q: Can the standard deviation of a data set be zero

A: Standard deviation can not be negative.

Q: Why is it useful to know the standard error of the mean? (Choose all that are correct.) It is…

A: here we know that Standard error is the standard deviation of its sampling distribution. or an…

Q: The last class of data to be examined is grouped data vs. ungrouped data. Differentiate between the…

A: 13,15,19, 21, 12,18,16,15,17

Q: In a study of 400 people, the mean age is 50 years and the standard deviation of age is 10 years.…

A:

Q: A study by the National Center for Health Statistics suggested that women between the ages 20 and 29…

A: 0.33271Explanation:For the given normal distribution with μ=26.8 and σ=7.4, the required proportion…

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

A: It is given that sample mean is 47 and the standard deviation is 12.

Q: me in male firefighters and you’ve decided to use the sample mean, ?̅, as the estimator. Explain why…

A: The sample mean refers to a statistic obtained by computing the arithmetic average of the values of…

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: White:Sample size Sample mean Sample standard deviation Non-whites:Sample size Sample mean Sample…

Q: You want to conduct a study to estimate the percentage of robberies in Texas that result in arrests.…

A: From the provided information,Margin of error (E) = 0.04Confidence level = 80%As proportion estimate…