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1. Consider a sample of 30 WMU engineering alumni. The population average salary is $55,000 and amongst the 30 alumni the sample standard deviation is $12,000. Assuming the population is normally distributed answer the following:
A. What is the probability that the average salary of the sample is greater than $60,000?B. What is the probability that the average salary of the sample is between $50,000 and $54,000?C. What is the probability that the average salary of the sample is less than $48,000?
Combine the following observations with the above data: 34, 46, 92, 51, 65, 76, 53, 99, 40, 46. Does the combined data set look normal?
suppose you have a normal distribution of values with a mean of 70 and a standard deviation of 4.5. find the
What is the minimum-cost order quantity for the shoes? What are the annual savings of your inventory policy over the policy currently being used by Keith?
suppose the average cholesterol level of children ages 2-14 is 175 mgdl with a standard deviation 30 mgdl. recently
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
Identify what you think is the best measure of variability to use for your example and explain why you believe it to be better than the others.
the previous exercise is very important to your understanding of tests of significance. if you dont use the applet you
in a large-sample test of hypothesis to compare the two means the test statistic was computed to be z 1.22. compute
suppose that z is a random variable with a n0 1 distribution. define a stochastic process via xt ?tz and note that for
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. What is the value of the population mea..
two variables x and y have a strong linear correlation. under what condition can you determine the direction of
A medical researcher estimates that no more than 55% of U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say they eat breakfast every day.
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