Finish times (to the nearest hour) for 10 dogsled teams are shown below. Find the class width. Use five classes. 283 363 248 290 281 284 336 364 280 265

Trials in an experiment with a polygraph include 98 results that include 24 cases of wrong results and 74 cases of correct results. Use a 0.05 significance level to test the claim that such polygraphs are correct less than 80% of the time. Based on the results, should polygraph test results be...

When 40 people used the Weight Watchers diet for one year, their mean weight loss was 3.0 lbs. Assume that the standard deviation of all such weight changes 4.9 lbs and use a 0.01 significance level to test the claim that the mean weight loss is greater than 0. Based on these results, does the...

A simple random sample of 35 filtered 100 mm cigarettes is obtained, and the tar content of each cigarette is measured. The sample has a mean of 13.2 mg and a standard deviation of 3.7 mg. Use a 0.05 significance level to test the claim that the mean tar content of filtered 100 mm cigarettes is...

A poll found that 329 out of 763 adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 92% confidence.

b. A random sample of 100 sales invoices taken from a company s file of sales invoices has an average value of Gh 42. 80 with a standard deviation of GH 7. 32 a. Find the 95% confidence limits for the true average value of invoices. b. A random sample of 100 sales invoices taken from a...

First you need the definitions of a type I and type II errors. A type one error exists when your reject the null but shouldn't have. In this case you pronounce the man guilty when really he was innocent. The p-value gives you the probability of committing a type I error. A type II error...

According to one study conducted at the University of Texas, 70% of all americans can do routine computations. If an employer were to hire 8 randomly selected americans, determine the probability distribution

School Enrollment of all -5 year old children, 56% are enrolled in school. if a sample of 500 such children is randomly selected, find the probability that at least 250 will be enrolled in school.

The average number of calls received by a switchboard in a 30-minute period is 15. a. What is the probability that between 10:00 and 10:30 the switchboard will receive exactly 10 calls? b. What is the probability that between 10:00 and 10:30 the switchboard will receive more than 9 calls but...