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An independent-measures research study was used to compare two treatment conditions with n = 4 participants in each treatment. The first treatment had a mean of M = 58 with a variance of s^2 = 28, and the second treatment had M = 52 with s^2 = 36. Do these data indicate a significant difference between the two treatments? Use a two-tailed test with α = .05 (Note: Because the two samples are the same size, the pooled variance is simply the average of the two variances.)
Construct a 90% confidence interval to estimate the difference of (average number of gallons sold on weekdays - average number of gallons sold on weekends). Assume the population standard deviations are the same for both weekdays and weekends.
Testing for population proportion - evidence that the proportion of data processing clerks who have gone through the new training and are no longer employed is less than .25?
Compute b1, slope of an OLS regression line using dollars spent as dependent variable (Y) and age as independent variable (X).
Suppose that monthly rental rates for unfurnished one-bedroom apartment in Ann Arbor, Michigan, are approximately normal in distribution, with a mean of $750 and a standard deviation of $150.
Does the data set represent a sample or a population? If it is a sample, describe the population from which it has been drawn.
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
With 95% confidence, what is the margin of error (to 2 decimals)? What is the 95% confidence interval estimate of the population mean?
For a population with a mean of μ = 50 and a standard deviation of σ = 10, how much error, on average, would you expect between the sample mean (M) and population mean for:
According to TNS Intersearch, 69% of wireless web users use it primarily for receiving and sending e-mail. Suppose that three wireless web users are selected at random. What is the probability that all of them use it primarily for e-mail?
Critically discuss the relationship between a sample and the type of population it is taken from? What population factors should be taken into consideration?
Does the regression equation account for a significant portion of the variance in the cognitive scores? Use a=.05 to evaluate the F-ratio.
If 37% of high school students said that they exercise regularly, find the probability that 5 randomly selected high school students will say that they exercise regularly.
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