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Given the following values: = 20, M = 16, = 0.7, conduct a one-sample z test at a .05 level of significance. What is the decision for a two-tailed test? A) to reject the null hypothesis B) to retain the null hypothesis C) There is not enough information since the sample size is not given.
a. Draw the network representation for this problem.
a student has submitted a concrete cylinder to the strength contest in engineering open house. suppose the strength of
the quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of
Because we usually control the value of a, one could simply set the probability of a type I error to a very small value, say 0.0001. What's wrong with given strategy?
On a (fictitious) Boards exam, the mean score is 500 with a standard deviation of 100. If your score is 635, what is your Z-score?
For the preceding problem you should find that there are significant differences among the three treatments. One reason for the significance is that the sample variances are small.
Does this sample indicate that the insurance company should change its premiums because life expectancy has increased?
a car enthusiast hypothesized that the average horsepower of 8 cylinder cars was less than 475. a random sample of 15
At the 0.01 level of significance, can we conclude that the manager's idea is effective in reducing the rate of towel theft?
a. Obtain the estimated ridge standardized regression coefficients, variance inflation factors, and R2 for the following biasing constants: c = .000, .005, .01, .02, .03, .04, .05.
In a random sample of 45 boards, what is the probability that the mean of the sample will be between 94.5 inches and 95.1 inches?
using a table of critical t-values of the t distribution find the range of values for the p-value for testing a claim
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