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A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes.
a. Determine the height and draw this uniform distribution
b. How long does the typical test taking time?
c. Determine the standard deviation of the test taking time.
d. What is the probability a particular student will take less than 45 minutes?
e. What is the probability a particular student will take between 45 and 50 minutes?
the study obtained a measure to determine how comfortable the shopper was in a store. Higher scores indicated greater comfort. Suppose the following data were collected. Use a = .05 to test for differences among comfort levels for three types of b..
It has been reported that 80% of taxpayers who are audited by the IRS end up paying more money in taxes. Assume that the auditors are randomly assigned cases and that one of the ways the IRS oversees its auditors is to monitor the percentage of ca..
a study is conducted to determine whether sunshine affects depression. eight individuals are given a questionnaire
In 2002 the Supreme Court ruled that schools could require random drug tests of students participating in competitive after-school activities such as athletics.
sat i scores around the nation tend to have a mean scale score around 500 a standard deviation of about 100 points and
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
a vertical line is drawn through a normal distribution at z -1.00. the line separates the distribution into two
A person makes random guesses for 10 true-false questions on a test. Find the probability that the student answers at least one question correctly.
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 16. At alpha = 0.05 is there enough evidence to reject the researche..
q1. the width of a confidence interval will bea. narrower for 95 confidence than 99 confidenceb. wider for a sample
Listed below are measured loads (in lb) on the left femur of crash test dummies used in the same cars listed in the Chapter Problem. Use a 0.05 significance level to test the null hypothesis that the different car categories have the same mean. Do..
What have you learned about statistics?" In developing your responses, consider - at a minimum - and discuss the application of each of the course elements in analyzing and making decisions about data (counts and/or measurements).
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