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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?
Convert the given fraction into its other two forms? Evaluate expression. Use a calculator to check.
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a test of sample means or sample proporti..
Forty percent of the time, sales are more than 470,000 and 10 percent of the time, sales are more than 500,000. What is the mean and standard deviation of the distribution?
Random sample of 36 theaters resulted in mean of $7.80. Population standard deviation is $1.00. Determine conclusion can be made at 10% significance level? How about 5% significance level?
Visits to Web sites. What kinds of Web sites do males aged 18 to 34 visit most often? Pornographic sites take first place, but about 50 percent of male Internet users in this age group visit an auction site such as eBay at least once a month. Inte..
Assume that the histogram for Math SAT scores is symmetric and concentrated about 450. Estimate the percent of students who score higher than 650 of the Math SAT.
The CEO of the business has nothing better to do wheras measured the temperatures of 26 department managers 1 to 4 times every day to get a total of 123 measurements.
Identify the sample and population. Also, determine whether the sample is likely to be representative of the population.
Indicate with Yes or No whether the given statement could apply to a data set consisting of 1,000 values that are all different. a. The 29th percentile is greater than the 30th percentile.
A psychologist wants to determine if there is a linear relationship between the number of hours a person goes without sleep and the number of mistakes he/she makes on a simple test. The following data is recorded. Determine the regression line equ..
A random sample of 40 clock batteries of this brand was selected. There is the probability of 0.95 that the sample mean lifetime will be less than t hours.What is the value of t?
Three different methods for assembling a product were proposed by an industrial engineer. To investigate the number of units assembled correctly with each method
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