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Some national statistics indicate the self-reported number of minutes per week of exercise is μ = 96.8 among college students. At the University of Wisconsin - Stevens Point an advertising campaign was aimed at new freshmen, encouraging them to increase their level of physical activity. Two researchers asked a random sample of these students to keep a log of their exercise time (in minutes) for a week near the end of their freshman year. They indicated the following values:
105 102 109 114 72 230 50 90 77
99 120 142 98 44 205 65 130
D) Explain how your hypothesis test would have been different if you had been asked to test whether exercise times following advertising blitz differed significantly from μ = 96.8. Would you have had the same conclusion?
E) Explain how your hypothesis test would have been different if you had been asked to compare these data to numbers from a control group, who had not received the advertising.
In 2001, the US Department of Labor reported the average hourly earnings for US production workers to be $14.32 per hour. A sample of 75 production workers during 2003 showed a sample mean of $14.68 per hour.
One possible explanation for why some birds migrate and others maintain year round residency in a single location is intelligence.
How large of a sample would be necessary if no estimate were available for the proportion that support current policy?
Equation of the regression line - Evaluate the equation of the regression line and Find y' when x=47 years.
A function sometimes associated with a continuous nonnegative random variable is the failure rate (or hazard rate) function which is defined as:
Surgical Intensive Care Unit would like to be better prepared by predicting number of surgical patients they must expect. Forecast for day 16 by using 3-period Moving Average?
Supposes that the diameter of bearings are independent normally distributed random variables with mean µB = 1.005cm and variance σ²B = (0.003)² cm² . The diameter of shafts are independent normally distributed random variables having mean µB = 0.9..
Experience ranges from 0 to 3. University ranking ranges from 1 to 4 (with 1 being the highest rank), and the Wonderlic test ranges from 0 to 50.
Find the value of Z-score- standard normal distribution.Find out a value of the standard normal random variable z, call it z0.
Find the probability that the average of those counts is more than 63.0 mosquitos per square meter. Assume that the variable is normally distributed.
Suppose we sample five boys and five girls, and find that the average height of the boys is 0.5 inches more than the average height of the girls.
Which of the following is the correct interpretation for the regression coefficient of Age? The regression coefficient is not significantly different from zero.
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