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A newspaper finds that the mean number of typographical errors per page is four. Find the probability that more than three typographical errors are found on a page.
Standard deviation is 35 hours. Is the company making acceptable light bulbs? Assume life spans are normally distributed.
Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 57 and 93?
A financial analyst wants to compare the turnover rates, I percent, for shares of oil-related stocks versus other stocks, such as GE and IBM. She selected 32 oil related stocks and 49 other stocks.
So construct a multiple regression model for predicting the crime rate based upon various explanatory variables unemployment rate, median income, education level.
What percent of batteries have a life span that is more than 2275 hours? Would it be unusual for a battery to have a life span that is more than 2275 hours? Explain your reasoning.
The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.8 auto accidents per day with a variance of 0.0016.
What is the maximum likelihood estimate of μ? What is an approximate standard error of the maximum likelihood estimate?
(a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important?
The time it takes a student to finish a electronics test has a uniform distribution between 50 and 70 minutes.
Uuse a level of significance of a =0.01 to test to see if you have sufficient evidence to support the claim that the defective rate exceeds 3%.
How do we use a least squares regression line? Please explain in your own words. What is the range for the coefficient of determination? Please explain in your own words.
A random sample of 50 female CFO's and a random sample of 40 male CFO's are selected. Find the expected value of the sample mean difference.
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