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The owner of the heating and air-conditioning company has two employees that make service calls. He is interested in the number of service calls made per day. The sample standard deviation for employee A is 1.05 calls per day and 1.23 calls per day for employee B. A random sample 40 days last year showed that employee A made an average of 4.67 calls per day. For a sample of 40 days employee B made an average of 5.02 calls per day. After the 0.05 significance level, is there a difference in the number of calls per day between the two employees? What is the alternative hypotheses and p-value?
A student doing a project for a statistics class wants to estimate the difference between the mean number of music CDs owned by male and female students.
The chance that all 50 residents in a neighborhood end up being the sample of residents selected is: the population of the suburb divided by 50.
A tractor is attached to a dump car by a cable which makes a horizontal angle of 10° with the track. It requires 1000 N to move the car.
A soft drink company has recently received customer complaints about its one-liter-sized soft drink products. Customers have been claiming that the one-liter-sized products contain less than one liter of soft drink.
A maintenance supervisor is comparing the standard version of an instructional booklet with one that has been claimed to be superior. An experiment is conducted in which 26 technicians are divided into two groups, provided with one of the booklets
Sampling senators The two-way table below describes the members of the U.S Senate in a recent year.
question suppose a null hypothesis is that the population mean is greater than or equal to 100. suppose further that
The average number of chocolate chips in a particular brand of chocolate chip chewy cookie is 19. The standard deviation is 2.6.
find the probability using the binomial distribution of obtaining 2 or more nonconforming units when sampling 5
How would the ratio of bean phenotypes change if you randomly pick 40 beans from the container? Will the ratio change significantly in each repetition - How would genetic drift affect the gene pool in a genetic bottleneck.
Assume that in a political science class, the teacher gives a midterm exam and a final exam Assume that the association between midtem & final scores is linear.
What is the probability of at least three hacker attempts during a month? What is the probability of a hacker attempt occurring every 15 days or less (assume a 30 day month).
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