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Let's say we have two groups, group 1 = a sample of athletes & group 2 = a sample of non-athletes, who are asked about the number of hours they exercise per day. Group 1 had a mean of1 = 4.5 and Group 2 had a mean of 2 = 1.7. Sample size for each group was N1 = 9 and N2 = 9. Standard deviations for group 1 and group 2 are s1 = .9 and s2 = 1.3. We want to know if the sample means differ from one another and decide to do independent-samples t test. Please compute the observed t statistic by hand. Report the t statistic using three decimal places.
Then use the table of probabilities for the standard normal distribution inside the front cover of the text to compute the following probabilities.
1. Calculate the sample mean and standard deviation for the time to reach -10°C for the Repair test panels discussed in Example 2.1.4 (p. 12).
Round the intermediate values to 2 decimal places. Round your answer to 2 decimal places, the tolerance is +/-0.05. Type of music preferred is independent or not independent of region of the country?
an issue that faces individuals investing for retirement is allocating assets among different investment choices.
Find a 99.9% confidence interval for the mean weight of all bumblebee bats at the following confidence levels (two places after decimal):(______, ______)
A consumer product agency wants to evaluate the accuracy of determining the level of calcium in a food supplement. There are a large number of possible testing laboratories but only three assay methods of interest
Let's make a deal. In the game Let's Make a Deal, the host asks a participant to choose one of three doors. Behind one of the doors is a big prize.
A replacement part for a machine must be produced within close specifications in order for it to be acceptable to customers.
For the most recent year available, the mean annual cost to attend a private university in the United States was $20,182. Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is $4,400.
Your company is planning to market a new reading lamp and has segmented the market into three groups: avid readers, regular readers, and occasional readers.
Imagine yourself at a fair playing one of the midway games. Pick a game and calculate the expected value and post your results along with how you calculated them. For example, you may decide to throw a basketball to try to win a $10 bear. You paid..
what is the equation that predicts mortgage amount from interest rate? Compute the slope of the straight line. compute the y-intercept of the straight line.
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