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A manufacturer of strapping tape claims that the tape has a mean breaking strength of 500 psi. Experience has shown that breaking strengths are approximately normally distributed, with a standard deviation of 48 psi. A random sample of 16 specimens is drawn from a large shipment of tape, and a mean of 480 psi is computed. Can we conclude from these data that the mean breaking strength for this shipment is less than that claimed by the manufacturer? Let alpha = 0.05.
a. Will you use z or t?
b. Find the critical value and the test statistic.
c. Find the p-value. What is your conclusion?
Determine the special property of standard normal distribution, compared to other normal distributions?
Determining the probability that the two choose the same number?
Men are usually the snow blower accident victims. There are several factors to consider, but we're going to choose the level of operating experience between men ages 21-35.
For the 20 test scores shown, find the percentile rank for a score of 86.
in october 2000 the u.s. department of commerce reported the results of a large scale survey on high school
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
The grouped frequency distribution below summarizes the results. Based on the grouped frequency distribution, you are to identify the mean and median for waiting times.
assume that iq scores are normally distributed with a standard deviation of 11 points and a mean of 100 points. if 140
At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
a researcher conducted an experiment on the effects of a new drug on depression. the researcher had a control group
a student observes the elevator usage of a building with a single elevator. this elevator will only allow people to go
What is the pooled sample estimate of adult smokers in Alaska?
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