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Assume that the data has a normal distribution. also assume that the standard deviation of the population, sigma, is known. find the critical value(s) used to test the claim that the mean of the population is greater than 90. Assume that the level of significance is 0.05
For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Management is concerned. Perform a hypothesis test to determine if this change in sales is a potential problem.
The height of women at a school are basically distributed with mean 66.4 in. and standard deviation 3.7 in. Determine the range of heights centered about the mean in which:
The random variable x has a normal distribution with mean=30 and standard deviation=30, find the probability that x assumes a value more than two standard deviations from its mean. more than three standard deviations from the mean.
An airline estimates that 98% of people booked on their flights actually show up. If the airline books 76 people on a flight for which the maximum number is 74
problem 1provide me a 1.5 pages of discussion and answer each question in detail. also label each question with each
there are c different types of coupon and each time you obtain a coupon it is equally likely to be any of the c types.
A civil service exam is given to 200 job applicants. In recent years, grades have followed a normal distribution with mean 66.5 and variance 100. The grades of the job applicants are distributed as follows:
The owner of a mail-order catalog would like to compare her sales with the geographic distribution of the population. According to the United States Bureau of the Census
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
A study regarding the relationship between age and the amount of pressure sales personnel feel in relation to their jobs revealed the following sample information.
Olympic Track related question: You know the last 5 race times at the same distance for 8 runners competing in a race. As such, you can calculate the mean, sd, and variance for each.
Additionally, method of delivery of drug (patch,pill, or nasal mist) was considered. In experiment, there were how many treatments?
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