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The author recorded actual temperatures along with temperatures that were predicted 5 days earlier. Results are listed below. Construct a 99% confidence interval of the mean of the population of "actual/forecast" differences. What does the result suggest about the forecast?
Actual: 80, 73, 78, 73, 82, 81, 74, 62
Forecast: 80, 79, 79, 78, 73, 79, 70, 69
If an applicant passes the "aptitude test for managers," what is the probability that the applicant will succeed in a management position?
Compute the standard error of the proportion and calculate the z-statistic. What is the probability of obtaining this value of the z-statistic if the null hypothesis is true?
Suppose they solicit 400 customers one day, and find that 250 of them have a Grayson's card. Assume that 60% of all Grayson's customers have a discount card, what is the probability of getting a sample proportion of at least 250 / 400=0.625?
when a health survey was conducted in some country. it found that 82 percent of the population was infected with a
Calculate η 2 , the percentage of variance accounted for by treatment.
Use technology to find the estimated minium required sample size. The minimum sample size required is ? Computer users round to the nearest whole number. What is a major obstacle to getting a good estimate of the population mean?
a study of the attendance at the university of alabamas basketball games revealed that the distribution of attendance
you and a friend decided to get your cars inspected. you are informed that 72 of cars pass inspection. if the event of
7 squirrels were found to have an average weight of 9.4 ounces with a sample standard deviation is 0.9. find the 95
The percentage 'y' of impurities per batch in a certain chemical product is a beta random variable with probability density
When using a t test for dependent means, show the steps involved in calculating the estimated population variance based on scores in this sample:
The average daily jail population in the United States is 706,242. If the distribution is normal and the standard deviation is 52,145, find the probability that on a randomly selected day the jail population is:
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