The standard deviation of test scores on a certain achievement test is  10.7 . A random sample of  70  scores on this test had a mean of  74.7 . Based on this sample, find a  95%  confidence interval for the true mean of all scores. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the lower limit of the  95%  confidence interval?   What is the upper limit of the  95%  confidence interval?

Q: A random sample of 300 college freshmen found that 112 of them own an iPhone.  Find a 95% confidence…

A: Given, Favorable Cases XX = 112112 Sample Size NN = 300300

Q: n = 260 and X = 208, construct a 90% confidence interval for the population proportion, p. Give…

A: Given data,x=208n=260p^=xn=208260=45=0.80

Q: employment. graduatés from the year 2016 were asked questions about Employment College students'…

A: Given : Sample Size, n = 1500 confidence level,c=0.95 Significance level, α…

Q: Use the data about the sample to calculate a 95% confidence interval for the average income of…

A: 1. The conditions for using t-distribution are: Sample size is small. Population standard deviation…

Q: 95% confidence interval for the true percent of workers in this city who have full health insurance…

A: The question is about confidence interval.Given :Randomly selected no. of workers ( n ) = 1700No. of…

Q: main, the

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Q: Calculate the lower 95% confidence interval for the population mean. (round to the nearest tenth)…

A: From the provided information, n=31x=56σ2=15 Confidence level = 95%

Q: How much more likely are college men than college women to participate in intramural sports?  A…

A: Given information: Number of college men surveyed, n1=688 Number of college women surveyed, n2=579…

Q: The figure to the right shows the results of a survey in which 2500 college graduates from the year…

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Q: SAT scores have a mean of 500 and a standard deviation of 100. Let’s continue with the above…

A: Given information :  Mean = x = 500 Standard deviation = σ = 100 level of significance = α = 0.05…

Q: Use the given data to construct a confidence interval of the requested level. X = 178, N=531,…

A: Given : Sample Size, n = N = 531 Number of successes, x = 178

Q: Thelma and Louise are each attempting to estimate the proportion of adults who enjoy listening to…

A: Given that.  p=0.29 C.I for Thelma's=(0.242 , 0.338) C.I for Louise's=(0.237 , 0.323)

Q: you used the percentage of alcohol to predict wine quality. The data are stored in Vinho Verde. For…

A: a. To construct a 95% confidence interval estimate of the mean wine quality rating for all wines…

Q: If n=30, 7(x-bar)=49, and s=14, construct a confidence interval at a 99% confidence level. Assume…

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Q: The following statistical study gives a sample statistic and a margin of error. Find the confidence…

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Q: If n = 41, ã=30, and s = 6, construct a confidence interval at a 80% confidence level.

A: It is given that Sample size n = 41 Sample mean = 30 Sample SD s = 6 The critical value of t at df =…

Q: A laboratory tested n = 101 chicken eggs and found that the mean amount of cholesterol was = 82…

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Q: If n = 15, the sample mean = 150, SD = 10, what is the confidence interval (using 99% confidence…

A: Given data,n=15x=150σ=10z-value at 99% confidence is Zc=2.576

Q: The figure to the right shows the results of a survey in which 1500 college graduates from the year…

A: For proportion of college students that expect to stay at their first employer for 3 or more years…

Q: Which of the following would result in the narrowest confidence interval? A sample size of 30 with…

A: Here we will use the concept of confidence interval  and using the formula of confidence interval we…

Q: A study found a confidence interval on the proportion of children that are hearing impaired was 0.04…

A: Given confidence interval is 0.04 to 0.16 i.e., p-E=0.04 -->1 p+E=0.16 -->2

Q: A 95% confidence interval for the proportion of all statistics students from a large high school…

A: The objective of the question is to understand the relationship between the confidence level and the…

Q: A toy manufacturer wants to know how many new toys children buy each year. A sample of 242 children…

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Q: A sample of 1100 observations taken from a population produced a sample proportion of 0.36 . Make a…

A: Given information Sample proportion = 0.36 Sample size (n) = 1100

Q: Out of 600 people sampled, 30 had children under the age of 18. Based on this, construct a 99%…

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Q: If n=25, z-46, and s=5, construct a confidence interval at a 95% confidence level. Assume the data…

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Q: Which one of the following statements about confidence intervals is false?   Given the same sample…

A: In this case, we need to identify the false statement for confidence interval.

Q: Mark each statement TRUE or FALSE. For these problems, assume that to estimate average time spent…

A: It is given that the sample size is 10.

Q: Translate the statement into a confidence interval. Approximate the level of confidence. In a…

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Q: Your analysis of the raw data indicates that 16 of the 30 students reported driving no more than 20…

A: From the given information, let X be the number of students reported no more than 20 miles per day.…

Q: You are comparing men and women on hours spent watching TV. You pick a sample of 12 men and 14 women…

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Q: A Gallup survey of 2324 adults (at least 18 years old) in the U.S. found that 417 of them have…

A: The formula of the confidence interval is,

Q: Tina catches a 14-pound bass.  She does not know the population mean or standard deviation.  So she…

A: From the provided information, The data values are as follow: 9, 12, 13, 10 and 10 Sample size (n) =…

Q: If [0.64, 0.82] is a confidence interval for the population proporlion. Find the value of the point…

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Q: A random sample of 300 college freshmen found that 112 of them own an iPhone. Find a 95% confidence…

A: Let n be the random sample , X be the number of own iPhone  Given n=300, X=112  Construct 95% CI for…