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Twenty students randomly assigned to an experimental group receive an instructional program: 30 in a control group do not. After 6 months, both groups are tested on their knowledge, the 38 on the test (with an estimated population standard deviation of 3); the control group has a mean of 35 (with an estimated population standard deviation of 5). Using the U.S level, what should the experimenter conclude?
(a) Use the steps of hypothesis testing,
(b) Sketch the distribution involved, and
(c) Explain your answer to someone who is familiar with the T test for a single sample, but not with the T test independent means.
Would the null hypothesis be accepted or rejected in this case?
Determine a 95% confidence interval for the population mean.
If the standard deviation is $89.46, find the probability that a randomly selected customer spends between $550.67 and $836.94.
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
Write introduction to SPC (STATISTICAL PROCESS CONTROL)? Describe the use of SPC tools used at D2D?
A business owner decides to use a binomial distribution to solve one of his problems.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
What is the standard deviation of expected returns for Stock X? For Stock Y?
For each of the 50 states and Washington, D.C., a number of statistics related to education are available for 1992
A random variable has the density curve as in the graph below. Find The height of the density curve?
Compute the probability that student eats at fast food restaurant 2 or more times per week?
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