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Weights are distributed normal with a mean of 132 pounds and a standard deviation of 27.4 pounds. In a random sample of 150, how many of them would be expected to weigh between 100 and 115 pounds?
Evaluate the factor effects. Find out which factors are significant in explaining yield.
Test at .01 level of significance if mean number of number of calories for Brand A 16 oz. yogurt cups is greater than mean calories for Brand B 16 oz. yogurt cups.
The following data were collected as part of a study of coffee consumption among male and female undergraduate students. The following reflects cups per day consumed:
Given that we have collected pairs of observations on two variables X and Y , we would consider fitting a straight line with X as an explanatory variable if:
The first three horses in the ninth race. If there are 12 horses entered in today's ninth race, how many Big Triple outcomes are possible?
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines? Please show work.
What is the probability that their average lifetime would be less than 510 hours? Use your calculator to solve this problem and give your answer as a number between 0 and 1, rounded to 3 decimal places.
The mean difference in times between the experiment is -9.4 minutes with a standard deviation of 2.8 minutes). Construct a 90% CI for the proportion of patients who experience stomach upset with the experimental medication.
What is Peter's median grade point at graduation? What is the shape of the grade point distribution?
A sample of 8 jars has a mean of 15.6 ounces and a standard deviation of 0.3 ounce. Is there enough evidence to support the consumer's conjecture at a = 0.05 and how can this be graphed?
Studies from a local mall show the typical shopper spends 0.75 hrs shopping. the standard deviation is 0.10 hours. A sample of 45 shoppers revealed the mean time spent increased to .080.
Draw the OC curve. If the average number of defects increased by to 10 per tractor, what would the probability of detecting the shift in a control chart?
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