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A newspaper finds that the mean number of the typographical errors per page is four. Find out the probability that exactly three typographical errors are found on a page.
Compute the sample mean and standard deviation.
Determine the probability that 427 companies in the sample electronically monitor their employees? (Select answer from below and please clarify work)
In a bike shop the average repair bill throughout a maintenance program's first year is $15.30 with the standard deviation of $7.00. Compute the probability a random sample of 40 customers will have
Write down the probability densities of t (1) distribution and t (∞) distribution, and provide the special distribution names of them.
Determine the probability that 6 or more were female? Compute the probability that fewer than 4 were female? Answer part (a) for the period from the 1918 to the present.
Form 94% Bonferroni Simultaneous confidence intervals for the differences. Interpret. Form 95% confidence intervals using Fisher's technique. Interpret
Estimate the value of the confidence coefficient z (a/2) for the condition below:
In problem 18 if x-bar = 505 and s = 20, the null hypothesis can be rejected with the p = 0.0062
At 5% significance the fail to reject the test statistic for Ho: (u1-u2) = 0, Ha: (u1-u2) < 0, n1 = 8, n2 = 8, x1-bar = 53.6, x2-bar = 61.5, s1 = 12.5 and s2 = 10.6 is t = -1.36.
When performing hypothesis tests or calculating confidence intervals based upon large samples, it is necessary to suppose that the data in the parent population(s) are distributed normally.
Suppose there are 18 homes in the Quail Creek area as well as 9 of them have the security system. Four homes are chosen at random: Determine the probability all four of the chosen homes have a secur
A multiple choice test consists of 60 questions. Each and every question has four possible answers of which one is right. If all answers are accidental guesses, determine the probability of getting
All Seasons Plumbing has 2 service trucks that frequently need repair. If the probability the first truck is available is .80, the probability the second truck is available is .51, and the probabili
Assume that replacement times for washing machines have a mean of 9.3 years and the standard deviation of 1.1 years. Find out the probability that 70 randomly selected washing machines will have a
On a specific test, IQ scores for adults follow the bell-shaped (symmetric) distribution with mean=100 and a variance of 100. In the random sample of 1250 adults, approximately how many would have I
Assume we want to determine the average number of purchases in a given hour in the local convenience store. Using this example, explain how you would go regarding determining this average through:
A student takes a 20-question multiple choice exam as well as guesses on each question. (This means that the probability of success on any one question is the same.) Each question has four choices,
Among the doctors belonging to a extremely large health system, 82% carry some kind of malpractice insurance. Assume that we randomly choose three doctors from the set of all doctors belonging to th
Compute the standard deviation of the data set?
Forty 2009 Prius vehicles were randomly sampled and their mileage ratings were recorded. The data are showed in the table below.
Find the mean and standard deviation of the following probability distribution:
The personnel manager at a company wants to investigate job satisfaction among the female employees. One evening after a meeting she talks to all 30 female employees who attended the meeting. Does t
A polling company gets an alphabetical list of the names of voters in precinct. They choose every 20th person from the list till a sample of 100 is obtained. They then call these 100 people. Does th
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the t