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A school has three tenth grade classes. All three classes took the same physics test. the mean score for the three class were 75, 71, and 78. Can the mean score for all tenth grade students be found by taking the mean of 75, 71 and 78? Explain.
It has been determined empiracally that for a certain egg producer, the number of cracked or broken eggs X, in a randomly slected box containing six eggs, follows approximately the distribution given in the table below:
A random sampling of financial analysts was asked to provide forecasts of earnings per share of a corporation's stock for the next year. The results are summarized as follows:
An independent financial advisor claims an average rate of return, μ, on a particular investment is at least 7%. In testing her claim, the correct pair of hypotheses is:
Assume sps professors have the average life normally distributed of 82 years, with population standard deviation of 5 years. Determine percent of sps professors will not live more than 80 years?
Suppose the number of tickets written per day follows a Poisson dictribution with mean of 6.5 tickets per day. Interpret the value of the mean.
Recognize and explain potential threats (up to 3) to external validity.
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
The average expenditure on Valentine's Day was expected to be $100.89 (USA Today,| February 13, 2006). Do male and female consumers differ in the amounts they spend?
Plot CEO salaries against the net profit of their respective companies, do you expect to find a linear correlation between the two?
According to Bienayme-Chebyshev rule, what percentages of these funds are likely to be within ±2 standard deviation of mean?
If Molly and Kathleen wishes to make a profit of $5,000 for summer, how many pupils do they require to enrol?
A survey of 30 adults found that the mean age of a person's primary vehicle is 5.6 years. Assuming the standard deviation of the populaiton is 0.8 year, find the 99% confidence interval estimate for the population mean.
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