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A mason is contracted to build a patio retaining wall. Plans call for the base of the wall to be a row of 50 10-inch bricks, each separated by ½ inch thick mortar. Assume that the bricks used are randomly chosen from a population of bricks whose mean length is 10 inches and whose standard deviation is 1/32 inch. Also suppose that the mason, on the average, will make the mortar ½ inch thick, but the actual dimension varies from brick to brick, the standard deviation of the thickness being 1/16 inch. What is the standard deviation of L, the length of the first row of the wall?
What is the probability that the sample mean would differ from the true mean by greater than .04 dollars if a sample of 183 5 gallon pails is randomly selected? Round answer to 4 decimal places.
In a clinical study of an allergy drug, 115 of the 204 subjects reported experiencing significant relief from their symptoms. At the 0.01 significance level, test the claim that more than half of all those using the drug experience relief.
Develop percent frequency distribution and construct bar chart and pie chart.
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
What is their maximum error of the estimated mean quality for a 92% level of confidence and an estimated standard deviation of 8?
Use the normal distribution to approximate the desired probability. Find the probability that in 200 tosses of a fair die, we will obtain at exactly 30 faces.
To find the necessary sample size to achieve the given level of accuracy of prediction.
In the Distance problems, the kids are given a Rate (speed) that a vehicle is going, as well as a Time that the vehicle travels, and asked to calculate the Distance travelled. In the Rate problems they are asked to compute Rate from the other two ..
For such groups of 800, would it be unusual to get 687 consumers who recognize the Dull Computer Company name?
The professor wishes to use a random-number table to determine which letter choice should correspond to the correct answer for a question.
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
Findout probabilities utilizing standard normal distribution. If the debt is normally distributed with a standard deviation.
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