MATH 225N Week 8 Final Exam Review Weeks 5 - 8

005399840152400 Final Exam Review 73430007643647801203416358825940768340MATH 225 625957240232Identify the null and alternative hypotheses A hospital claims that the mean wait time for emergency room patients is at least 55 minutes. A group of researchers believe that this is not accurate, and want to show that the mean wait time is less than 55 minutes. Identify the group's null hypothesis, H0, and the alternative hypothesis, Ha, in terms of the parameter μ. 625957227532Identify the null and alternative hypotheses Which of the following results in the null hypothesis μ≥38 and alternative hypothesis μ<38? ❏A fitness center claims that the mean amount of time that a person spends at the gym per visit is at most 38 minutes. ❏A fitness center claims that the mean amount of time that a person spends at the gym per visit is fewer than 38 minutes. ❏A fitness center claims that the mean amount of time that a person spends at the gym per visit is 38 minutes. ❏A fitness center claims that the mean amount of time that a person spends at the gym per visit is more than 38 minutes. 625957799033 The graph below shows the graphs of several normal distributions, labeled A, B, and C, on the same axis. Determine which normal distribution has the largest mean. 2451078289219 625957799033 A study is planned to research the effects of drinking coffee on hours of sleep. Would an experimental or observational study design be more appropriate? An observational study should be used because it is not possible to control whether or not a person drinks coffee. An observational study should be used because it is not possible to control the number of hours of sleep a person has. An experimental study should be used where the consumption of coffee is the experimental factor. An experimental study should be used where the number of hours of sleep is the experimental factor. 625957799033 The answer choices below represent different hypothesis tests. Which of the choices are one-tailed tests? Select all correct answers. H0:p≥0.46, Ha:p<0.46 H0:p=0.34, Ha:p≠0.34 H0:p=0.63, Ha:p≠0.63 H0:p=0.35, Ha:p≠0.35 H0:p≥0.39, Ha:p<0.39 625957799033 The following frequency table summarizes a set of data. What is the five-number summary? 3986224097124761384247883 625957227532Find the sample size required to estimate a population mean with a given confidence level Suppose the number of dollars spent per week on groceries is normally distributed. If the population standard deviation is 7 dollars, what minimum sample size is needed to be 90% confident that the sample mean is within 3 dollars of the true population mean? Use the table above for the z-score, and be sure to round up to the nearest integer. 2690800219308 625957799033 The average length of an eel from a population of short-finned eels is unknown. A random sample from the population yields a sample mean of x¯=1.9 feet. Assume the sampling distribution of the mean has a standard deviation of σx¯=0.6 feet. Use the Empirical Rule to construct a 95% confidence interval for the true population mean length. 625957799033A police officer claims that the