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Some Statistics students were interested in finding out in there was a relationship between the number of hours of study for a chapter and the score on that test. On the basis of the number of hours their classmates studied for the chapter test and the score on that test (out of 100%), the least squares regression line was y = 72.53 + 5.88x, where x is the number of hours spent studying and y is the predicted score on the test.
suppose that the average life of a refrigerator before replacement is m 14 years with a 99.7 of data range from 8 to
In a large clinical trial of 500 patients treated with a new drug, 40 reported sideeffects how many patients would need to be sampled to estimate the desired proportion to within a margin of error of 1%, using 98% confidence?
At the 0.10 level, do males and females differ significantly in terms of making multiple transactions? Determine and interpret the p-value for this test, then construct and interpret the 90% confidence interval for π1 - π2.
A study is done to determine if Company A retains its workers longer than Company B. Company A samples 15 workers, and their average time with the company.
In a survey on the quality of customer service at Car Toys, customers were asked to rate the service on a scale from 1 to 10, with 10 being that a customer was completely satisfied.
A factory produces Xn gadgets on day n where the Xn are independent and identically distributed random variables, with mean 5 and variance 9.
If the value of the mean square for Factor A increases, will the value of the test statistic for Factor A increase or decrease?
What should the firm's price-to- earnings (P/E) ratio be if the required rate of return on stocks of this type is 15 percent?
calculate the sample size needed given these factorsanova fixed effects omnibus one-waysmall effect sizealpha .05beta
Describe how you might sample books using a probability sampling technique. Now speculate on the ways that the outcomes of your research might diff er using the two techniques.
The time between the successive renewals, for a certain renewal process {N(t),t ≥ 0}, is a continuous random variable whose probability density function is the following:
Is this survey valid or not valid for testing the hypothesis that the proportion of college football players at our university with at least one concussion is less than the national average?
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