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Your company sells exercise clothing and equipment on the internet. To design the clothing, you collect data on the physical characteristics of your different types of customers. Here are the weights for a sample of 24 male runners. Assume that these runners can be viewed as a random sample of your potential customers. The weights are expressed in kilograms.67.8 61.9 63.0 53.1 62.3 59.7 55.4 58.9 60.9 69.2 63.7 68.3 64.7 65.6 56.0 57.866.0 62.9 53.6 65.0 55.8 60.4 69.3 61.7Based on this confidence interval, does a test ofHo: µ= 61.3 kgHa: µ≠ 61.3kgReject Ho at the 5% significance level?
Find the standard error of the mean. Also establish an interval estimate around the sample mean using one standard deviation of the mean.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
A random sample of 51 observations was selected from a normally distributed population. The sample mean was xbar = 88.6, and the sample variance was s2 = 38.2.
Two pediatricians want to investigate a new laboratory test that identifies streptococcal infections. Dr. J uses the standard culture test, which has a sensitivity of 90% and a specificity of 96%. Dr. M uses the new test, which is 96% sensitive an..
Suppose we select a sample of 16 cuts from various CDs sold by CRA CDs, Inc. What can we say about the shape of the distribution of the sample mean?
Determine a 95% confidence interval for mean amount spent by all Internet shoppers.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of 3.3 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
What is the probability that a randomly selected automobile manufactured by the company will have a defective microprocessor?
What is the variance and standard deviation (of profit, NOT of tire life) for producing an all weather tire? Of producing a high performance tire?
He estimates that he/she has a 45% chance of success with each customer. What is the probability that he/she will earn his/her bonus today?
Determine the p-value, and at 95% confidence, test the hypotheses.
The probability that a student passes a written test for a private pilot's license is 0.75. What is the probability that a student will fail the test on the first attempt and pass it on the second attempt?
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