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In a study of police gunfire reports during a recent year, it was found that among 500 shots fired by New York City police, 160 hit their targets; and among 280 shots fired by Los Angeles police, 70 hit their targets. We want to use a 0.05 significance level to test the claim that New York City police and Los Angeles police have the same proportion of hits.
Assume population 1 is New York City police gunfire and population 2 is Los Angeles police gunfire. Answer question 8-10:
The test statistic (keep 4 decimals)
Find the p-value (keep 4 decimal places).
Jen's dog broke off her six-inch-long pencil at a random point on the pencil. Find the density function and the expected value of the ratio of the lengths of the shorter piece and the longer piece of the pencil.
Weekly income of more than $429.35, the value of the standard deviation of the weekly earnings of the bus drivers is 15. is it true?
In the 2000 census of the United States, it was determined that the average household size was 2.59 persons per household (http://www.census.gov).
Assume there are 21 homes in the Quail Creek area and 9 of them have a security system. Six homes are selected at random: What is the probability none of the six selected homes have a security system?
The heights and shoe sizes of the starting lineup of a tournament baseball team are listed below. Use a calculator to determine the correlation coefficient.
What exact percent of the normal curve falls between the mean and -3 to +3 standard deviations from the mean? (Hint: the correct answer is not 100%)
The population of employees in a certain large office building has weights distributed around a mean of 150 pounds, with a standard deviation of 20 pounds.
Find the mean/standard error of the sampling distribution of the proportion. Assume that 26% of students at a university wear contact lenses. We randomly pick 300 students.
a brewerys filling machine is adjusted to fill bottles with a mean of 31.2 oz. of ale and a variance of 0.003.
Would you use the regression model to predict a firm's pension funding?- Does the model explain much of the variation in firms' pension funding on the basis of profitability?
The mean monthly expenditure on gasoline per household in Middletown is determined by selecting a random sample of 36 households. The sample mean is $68 with a random sample standard deviation of $17.?Calculate a 90% confidence interval for the me..
Calculate the mean and variance of X. Calculate the mean and variance of Y. Calculate the covariance and correlation between X and Y. Is there a positive or negative relationship between X and Y? Is the relationship strong, weak or moderate?
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