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The length of a rod is normally distributed with mean 4 inches and variance 0.01 square inch. Two such rods are placed end to end and fitted into a slot. The length of the slot is 8 inches with a tolerance of -0.1 to 0.1 inch. What is the probability that the two rods will fit?
Find the probability that the time taken for a randomly chosen customer to be dealt with by a cashier is more than 180s.
Taking α to be 0.05, what is/are the critical values associated with testing your hypothesis?
The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience.
At the 0.01 significance level is it reasonable to conclude that the modifaction reduced the number of traffic accidents?
An investor wants to assess at confidence level of 98% if a medicament can improve the marks of students. He notices that for the following daily dozes: 2,2.5,3,4.5,7 mg, the improvement over the students that studied the same but took no mental b..
Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com).
12 mature citrus trees of one variety and 15 of another gave means and standard deviations of their heights as 13.8 and 12.9 ft (means), and 1.2 and 1.5 ft (standard deviations).
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?
At the .01 significance level, can she conclude that there is a difference between how well the different tutorials work for the students?
If the annual advertising expenditures are known to be normally distributed and the standard deviation of the population (σ) is $750, what would be the 95% confidence interval for the true mean advertising expense?
Determining whether or not the proportion of the population in favor of Candidate A is significantly more than 80%. The value of the test statistic and the p-value respectively are?
If member of sales force submits the entertainment expense (dinner cost for four) of $190, must this expense be considered unusually high. Calculate and interpret z- score for each of six entertainment expenses.
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