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Researchers studied the effects of adding an exercise program to dieting in the achievement of weight loss. A sample of 45 men ages 18-20 (Group 1) were observed for weight loss using a diet only, and another independent sample of 52 men ages 18-20 (Group 2) were put on the same diet, but with an added exercise program. The mean weight loss for Group 1 was 7.7 pounds with a standard deviation of 4.4 pounds, and the mean weight loss for Group 2 was 14.4 pounds, with a standard deviation of 5.8 pounds. Calculate the upper bound of a 99% confidence interval for the difference in mean weight loss for the two groups, assuming the two population standard deviations are equal.
Assume that the average person in America weighs 150 pounds (μ). You want to determine whether colleges students weigh less than the average America, Following are the weights collected on a sample of colleges students: 120, 105, 166, 170, 145, 14..
which of the following does not explain a possible relationship between variables when the null hypothesis is
if a basketball player is a 60 free throw shooter then on average how many free throws will he make in a game with six
The mean life time of the sample of 160 tires will be less than 39,000 miles? Interpret the probability in terms of the truth of the manufacturer's claim.
The mean area of several thousand apartments in a new development is advertised to be 1250 sq. ft. An engineer measured a random sample of apartments:
consider writing onto a computer disk and then sending it through a certifier that counts the number of missing pulses.
The linear correlation coefficient, r, measures the strength of the linear relationship the variables in a set of ordered pairs (x,y). What is the maximum and minimum values for r?
The customers arriving between 0 and 1 have to wait until the store opens. Suppose X is the total times that these customers have to wait. Calculate Var(x).
Metal stamping machine is producing 10 defective parts per hour. Determine the probability that three or fewer defective parts will be output in a randomly chosen hour, by using the Poisson distribution?
question 1. in an article a random sample of 42 felons convicted of impulsive murder was compared to a random sample of
What do you notice about the two histogrum and (therefore) about the estimates of probability of getting above 0?
Assume we know the length of time a battery will hold a charge is a normal distribution with a mean of 50 hours and a standard deviation of 15 hours.
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