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At a certain university the mean income of parents of the entering class is reported to be $91,600. The president of another university feels that the parents'income for her entering class is greater than $91,600. She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
Predict the number of accidents per year (to the nearest whole number) for a person whose age is 45 and who works 42 hours per week.
Suppose the inspector is unhappy with the previous result and would like to resample. How many rolls should be sampled to estimate the mean tensile strength within 1.5 PSI with 95% confidence?
A dependent samples t test is typically more powerful than an independent samples t test because? Reduces participant/subject variability between groups.
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.
If 100 percent of a days production is inspected whenever the sample of 10 gives 2 or more defectives, then what is the pobability that 100 percent of a days production will be inspected?
Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
A 1-minute television ad costs $30,000 and 1- minute radio add costs $5,000. French Enterprise should decide how many television ads to buy. Write down the decision variables?
ph in the water is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a pH of 7. For which p-value will she fail to reject the null hypothesis?
Joe has started an iphone booth in the mall. His francise booth and other startup costs total $82,000. Joe expects to pay $240 per iphone unit and sell them for $390 each. Joe needs to reach a 10% profit margin.
Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level
This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.
Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?
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