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Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent simple random samples selected from normally distributed populations. Independent samples from two different populations yield the following data. 1 = 236, 2 = 905, = 88 = 13 The sample size is 381 for both samples. Find the 85% confidence interval?
To test whether the population standard deviation differ significantly using Chi-Square test.
The weights of adult males is normally distributed with a mean of 200 pounds and a standard deviation of 40 pounds. Calculate the probability that an adult male weighs less than 130 pounds.
Twelve students randomly selected from the entering class of college had the following SAT scores in math and English population mean=500, sigma=100
What four steps should be used in evaluating expressions? Could these steps be skipped or rearranged? Explain your answersr.
Committee were chosen from among the workers without regard to gender: Does this represent a binomial random distribution? Why?
Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.
Run a simple regression of the dependent variable demand on the independent variable price and observe the coefficient on price.
In Excel use the Descriptive Statistics and comment on the mean, the skewness, the standard deviation and kurtosis.
Linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level alpha. n = 11, Alpha = 0.01
To forcast the sample size within 0.02 with 90 percent confidence. The CEO of the organization needs to forcast the proportion of Canadians who own their house.
Using the empirical rule, what is the approximate percentage of the men between the following values? A. 176 cm and 186 cm B. 166 cm and 196 cm.
Survey of 8000 women, 5431 say they change their nail polish once a week. construct a 95% confidence interval for the population proportion of women who change their nail polish once a week.
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