1. What is the point estimate for the proportion of people who liked the chocolate bar? 2. At 99% confidence what is the margin of error 3. Construct a99% confidence interval for the true proportion of people who likes the chocolate bar

Q: The actual proportion of female students is approximately 60%. Compare the actual proportion with…

A: Given : The actual proportion of female students is approximately 60%. Population Proportion (P) =…

Q: Suppose you want to produce an estimate on the percent of students who return to college after their…

A:

Q: Explain in what situations you can use the z statistic to construct a confidence interval for the…

A:

Q: What are the upper and lower limits and the width of CI if you change the confidence level to 99% M…

A: Formula : CI=point estimate ± ME

Q: Out of 400 people sampled, 32 had kids. Based on this, construct a 95% confidence interval for the…

A: Solution: Let X be the number of people had kids and n be the sample number of people. From the…

Q: 4. Find the 95% confidence interval for the mean wedding cost for the Piedmont Triad. How does it…

A: Since we're dealing with a small sample size (n=40) and don't know the population standard…

Q: Explain in words what effect an increase in confidence level would have on the width of the…

A: Given information: The statement is given related to the effect of an increase in confidence level…

Q: A new fertilizer was applied to the soil of 276 bean plants. 24% showed increased growth. Find the…

A: Given Data: p=0.24 n=276   z-value corresponding to 95% Confidence level=1.96

Q: The confidence interval was (36,45) What was the margin of error? What was the point estimate

A: Answer: From the given data, The confidence interval = (36,45)

Q: What is the likelihood that a 90% confidence interval will not cover the true population value?…

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Q: What is the upper bound of the confidence interval? A 98% confidence interval for the data: 25, 38,…

A: We have given data, X 25 38 62 45 61 38 21 42 31 35 The confidence level is 1-α=0.98.

Q: Refer to the data below: To estimate the mean height of female high school juniors, you take a…

A: Solution: Given data Sample size(n) = 30 To find : Point Estimate  of mean (μ) =??

Q: The confidence interval was (22, 26) What was the point estimate? What was the margin of error?

A: Given confidence interval was (22, 26)

Q: Relative risk is defined to be the ratio of success proportions between two groups. Suppose that a…

A: It is given asThe 95% confidence interval for relative risk is:CI = ( 1.32, 2.62 )

Q: Suppose a random sample of 50 basketball players showed the average height to be 78 inches. Also,…

A: From the provided information, Population standard deviation (σ) = 1.5 Sample mean (x̄) = 78 Sample…

Q: What is the effect of increasing the confidence level on the margin of error?

A: The formula for calculating the margin of error is,   The margin of error is directly proportional…

Q: Explain when you would use the z value or the t-value to calculate a confidence interval

A: Z value: The z value is used for finding the confidence intervals for single population proportion,…

Q: In a survey of 1007 parents of children ages 8 to 14, 75% say they are willing to get a second job…

A: Given information- A proportion of parents say they are willing to get a second job or part-time…

Q: A researcher wanted to compare the percentages of men and women who play the lottery.  They randomly…

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Q: What does the 95% represent in a 95% confidence interval

A: Solution CI=95%

Q: For a confidence level of 99% with a sample size of 22, find the t-score. Did not see how to work…

A: The provided information is:

Q: Explain how to find the 95% confidence interval for the mean by hand using the following data set…

A: For the given sample, x¯=59.05, from the excel function, =AVERAGE(J2:J21)s=4.6394, from the excel…

Q: What is the difference between a prediction interval and a confidence​ interval? And when is it…

A: Confidence Interval :  Confidence intervals tell you how well you have determined a parameter of…

Q: A survey was conducted to find out mean expenditure of students in a week. Data collected from a…

A: Givensample size(n)=35Mean(x)=80standard deviation(s)=15confidence level=99%

Q: the difference P-P2 when x 40, n, = 80, x, = 20, and n, nce in 60. Round the answer to at least…

A: Given : n1 = 80 x1 = 40 n2 = 60 x2 = 20 confidence level,c=0.8

Q: Here are some ratings on a scale of 1-10. Use confidence interval of 99% confidence. What is the…

A: Given data, 8, 7, 3, 10, 4, 4, 8, 8, 7, 8, 3, 8 n=12 Sample mean and sd is x=6.5 s=2.35

Q: % confidence interval for the mean percentage of airline reservations being canceled on the day of…

A: A 90% confidence interval for the mean percentage of airline reservations being canceled on the day…

Q: A psychologist asked a random sample to complete a depression questionnaire. On average, children…

A: The 95% confidence interval for the population mean depression score of children, will signify that,…

Q: What would answer be at 99% confidence interval?

A: We have given that,  Sample proportion (p̂) = 64% = 0.64 and sample size (n) = 550 Then,  We will…

Q: What happens to the width of a confidence interval as the significance level, a, decreases?

A: There is two things Significance level: which is the prefixed probability of type I error before any…

Q: What is the lower endpoint of a 95% confidence interval for the percent of students who like online…

A: Given Level of significance ɑ=0.05, x=92, n=134

Q: Example:  You would like to construct a 90% confidence interval for the proportion of graduating…

A: Obtain the value of the point estimate. The value of the point estimate is obtained below: Thus,…

Q: whats a confidence interval?

A: Confidence intervals: Confidence intervals are the limits for the point estimate of population…

Q: A psychologist asked a random sample to complete a depression questionnaire. On average, children…

A: We assume the population is normally distributed.

Q: Z-score for an 88% confidence level

A: The objective of the question is to find the Z-score for an 88% confidence level. The Z-score, also…

Q: Describe about the INTERPRETATION OF A CONFIDENCE INTERVAL.

A: Confidence Interval: Confidence interval is the interval estimate of the population parameter. It is…