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Two text books are selected at random from a shelf that contains three statistics texts, two mathematics texts and three physics texts. if x is the number of statistics texts and y the number of mathematics texts actually chosen, construct a table showing the values of the joint probability distribution of x and y.
The branch manager of a pet supply store wants to study characteristics of customers of his store. In particular, he decides to focus on two variables
Explain the difference between a left tail, two-tailed, and right tailed text. When would we choose a two tailed test? How can we tell the direction by looking at a pair of hypothesis?
Your financial advisor sees this and tells you there is a 100% chance XYZ stock will gain over the 2-month period. Would you continue to use this financial advisor? Explain.
Use the traditional method to test the given hypothesis. Assume that the population is the normally distributed and that the sample has been randomly selected.
An experiment ws designed to estimate the mean difference in weight gain for pigs fed ration A as compared with those fed ration B. Eight pairs of pigs were used. The pigs within each pair were littermates.
What is the approximate probability that the average weekly postage expense for the past 52 weeks will exceed the budgeted amount of $ 400?
ABC Auto Insurance classifies drivers as good, medium, or poor risks. Drivers who apply to them for insurance fall into these three groups in the proportions: 30 percent, 50 percent, and 20 percent, respectively.
Her mean waiting time was 7.4 minutes. Assume that the standard deviation has been historically known to be 2.2 minutes. At the .05 significance level, test the claim that the mean waiting time is less than 10 minutes.
The following random sample was collected: 22 33 44 6 The 80% confidence interval for the mean is?
By using a level of significance of .10, is there evidence that the population mean weight of the candy bars is greater than 4.3?
A random sample of 15 college graduates revealed that they worked an average of 5.3 years on the job before being promoted. The sample standard deviation was 1.2 years. Using the 0.95 degree of confidence, what is the confidence interval for the p..
The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
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