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A freshman in college wanted to estimate the average weight gain of freshmen during their first year in college. She randomly selected 43freshmen during the first week of school at the beginning of the year and weighed them. During finals week of the last term of the year, she weighed the same 43 students. She recorded the weight change of each- a positive value indicated a weight gain while a negative value indicated a weight loss during the year. The sample mean, x over bar x,was 11.1 pounds. Assume is 2.7 pounds and that all conditions are satisfied for inference to all college freshmen.
a. Construct a 90%confidence interval for mu Subscript Upper X μX, the average weight gain of all college freshmen.(Round both bounds to TWO decimal places.)
b. What is the value of the lower bound of the confidence interval?
c. What is the value of the upper bound of the confidence interval?
Find the probability of Among three children, there is exactly one girl. Among three children, there are exactly two girls. Among three children, all are girls.
At the .10 significance level, can we conclude that there is a difference in the amounts quoted?
Diamonds. Consider the diamond data of which Table 28.4 (page 28-35) is an excerpt. We are interested in predicting the total price of a diamond. Fit a simple linear regression model using Carat as the explanatory variable.
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Determine percentage of boys in this age range have carbohydrate intake above 140g/1000cal and carbohydrate intake below 90g/1000cal?
certain organic contaminants in soil can be driven out using hot air and steam. if 30.0 m3 air partial pressure of
Suppose that 1 out of 500 infant's are born with Down's Syndrome.
Calculate the start and finish times for each activity and determine the minimum number of weeks for completing the project. Find the critical set of activities for the project.
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
Find the maximum and minimum prices of the houses a contractor will build to include the middle 65% of the market.
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