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1. Suppose you roll a six-sided die 7 times and count the number of fives. What is the probability you get exactly two fives?
2. The probability distribution of the daily number of customers at the YumYum is given below.
Daily number of customers 20,40,60,80
Probability 0.2,0.3,0.4,0.1
- What is the probability that on a given day the YumYum has more than 30 customers?
- What is the expected value of the number of daily customers?
- What is the standard deviation of the number of daily customers?
Construct a 90% confidence interval on the difference in fraction nonconforming between the two processes."
for the data in the following sample8 1 5 1 5a. find the mean and the standard deviation.b. now change the score of x 8
The sample mean production rate for the 18 employees was 80 parts per hour. The sample standard deviation was 10 parts per hour. Construct the 90% confidence interval estimate for the mean production rate for the new method.
According to the National Institute for Occupational Safety and Health, job stress poses a major threat to the health of workers. A national survey of restaurant employees found that 75% said that job stress had a negative impact on their personal..
Simulate a random selection of three people from the applicant pool, and make a decision about the likelihood that a fair process would result in hiring all women.
Consider a pair of random variables X and Y which have joint probability density fx,y(X,Y) which is a constant over the region 0 =0.3].
A survey was designed to study how business operations vary according to their size. Companies were classified as small, medium, or large.
Figure 2.8. A solution to the eight-queens puzzle. The ``eight-queens puzzle&; asks how to place eight queens on a chessboard so that no queen is in check from any other (i.e., no two queens are in the same row, column, or diagonal). One possible ..
In a study of the consumer's view of the economy, the probability that a consumer would buy a house during the year was 0.0013, and the probability that the consumer would buy a car during the year was 0.198. There was also a 0.0100 probability t..
Assuming normal populations with equal standard deviations, use the 0.01 level in examining whether pulling the trailer uses significantly less fuel than driving with the rooftop carrier.
define the terms parameter and statistic be sure that the concepts of population and sample are included in the
Assuming the population variances from both offices are equal, is there evidence of a difference in the mean waiting time between the two offices? Use α = 0.05
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