Sleeping outlier: A simple random sample of ten college freshmen were asked how many hours of sleep they typically got per night. The results were 24, 8, 6.5, 6, 9, 8.5, 7.5, 6.5, 8.5, 9.5     The data contain an outlier that is clearly a mistake. Eliminate the outlier, then construct a 95% confidence interval for the mean amount of sleep from the remaining values. A 95% confidence interval for the mean amount of sleep from the remaining values is ___ < u < ___.

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

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Q: Suppose we wanted to estimate the average amount of sleep (in hours) a college student gets a night.…

A: Confidence interval : Confidence interval is a range of values it contains the true population…

Q: 1. A study of 40 English professors showed that they spend, on average, 12.6 minutes correcting a…

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Q: At a large university in Conway, South Carolina, the Dean wants to know what proportion of students…

A: We have given thatn = 200x = 145Confidence level (c) = 99% = 0.99Significance level (α) = 1 - c =  1…

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

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Q: Ten different families are tested for the number of gallons of water a day they use before and after…

A: From the provided information, The difference between before and after are as follow: Before…

Q: A statistics instructor randomly selected four bags of​ oranges, each bag labeled 10​ pounds, and…

A: Given X-bar=9.45 n=4

Q: Do people walk faster in the airport when they are departing or when they are arriving? Researchers…

A: given data departing travellers:x¯1  = 256s1 = 31n1 = 45arriving travellersx¯2  =241s2 = 58n2 =…

Q: A second-semester junior at a large high school wants to estimate the number of colleges a senior…

A: We have given that,  The data set is,  1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 7, 7, 8, 9 Then,…

Q: he chancellor wants you to do a research study on the number of hours students report sleeping in a…

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Q: What is the effect on a confidence interval if one decreases both sample size and the level of…

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Q: The principal randomly selected six students to take an aptitude test. Their scores were: 88.0 84.1…

A: Solution: Let X be the score. The given data is 88, 84.1, 74.9, 83.2, 83.7 and 85.5.

Q: How many subjects would be needed to ensure that a 95% confidence interval estimate of BMI had a…

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Q: 4. At private college the achievement test is used for advanced study placement. Counselors selected…

A: Solution: 4. Let X be the score. From the given information, x-bar = 450, s=29 and n=144. The…

Q: Toby wants to know the average price of new cars at a particular dealearship. He randomly selects a…

A: We have given that  Sample size=n=31 Mean=xbar=19500 Standard deviation=S=1640 95% confidence…

Q: A survey of 4646 randomly selected homeowners finds that they spend a mean of $66$66 per month on…

A: It is given that sample mean is 66 and the standard deviation is 12.