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A local newspaper claims that 60% or more of the items advertised in its classified advertisement section are sold within 1 week of the first appearance of the ad. To check the validity of the claim
A local newspaper claims that 60% or more of the items advertised in its classified advertisement section are sold within 1 week of the first appearance of the ad.
A sample of 15 workers reveal the following minutes: 29, 38, 38, 33, 38, 21, 45, 34, 40, 37, 42, 30, 29, 35. Develop 98% confidence interval for the population mean. Interpret your result.
How many of them were red when you entered the intersection?" Of the 880 respondents, 171 admitted that at least one light had been red. Follow the four-step process to construct a 95% confidence in
Suppose 39 women used skin cream for 22 weeks. At the end of the period, a dermatologist judged whether each womam exhibited skin improvement. The results show that 22 women improved. Do the data pr
If a company employs 3,500 people and if a random sample of 175 of these employees has been taken by systematic sampling, what is the value of k?
Weights of women in one age group are normally distributed with a standard deviation of 21 pounds. a researcher wishes to estimate the mean weight of all women in this age group. Find how large a sa
The chief of security for the Mall of the Dakotas was directed to study the problem of missing goods. He selected a sample of 100 boxes that had been tampered with and ascertained that for 60 of the
For a random sample of 40 people, what is the 95% confidence interval of the proportion of people who feel that there is too much violence on TV?
A poll of 800 students found that 72% had cell phones with a 98% level of confidence. What is the margin of error for this poll?
Describe a 5-step hypothesis test for two variances for a particular claim related to your work or life environment. You need to state the claim, define the null and alternate hypothesis, identify t
The bottom 1.5% of students must go to summer school. What is the minimum score you would need to stay out of this group?
The lifetime of a new brand of clock battery is normally distributed with a mean of 8,200 hours and a variance of 2,500 hours. A random sample of 40 clock batteries of this brand was selected.
Suppose a simple random sample of size 43 is selected from a population with o = 12. Find the value of the standard of the error of the mean in each of the following cases (use the finite population
There are 400 employes and 100 of them smoke. There are 250 males working for the company and 75 of them smoke. What is probability of an emloye selected random:
Let the random variable X count the number of correctly processed orders. Compute the expected value of X , the variance of X and the standard deviation of X.
Find the evaluation score confidence intervals for the following two departments: Department 1 and Department 4 combined. Find the confidence interval at the 95% level. Use s = 6.06 and the mean 17.
35 sophmores 27 juniors and 50 seniors are randomly selected from 522 sophmores 382 juniors and 346 seniors at a high school. What sampling technique is used?
The amounts of money requested on home loan applications for a mortgage company follow the normal distribution with a mean of $70,000 and a standard deviation of $20,000. A loan application is recei
Suppose that the referee for a football game has two coins that look the same. If the coin is weighted, what is the probability that the test designates it as being weighted?
Of those mountain climbers who attempt Mt. Mckinley, only 65% reach the summit. In a random sample of 16 mountain climbers who are going to attempt Mt. Mckinley, what is the probability that at leas
How does a box plot relate to the normal distribution? In what ways are they similar? In what ways are they different?
Determine whether P constitutes a Bayesian network with the DAG X -> Z <- Y:
If the mean number of small business failures per month is 10, what is the probability that exactly four small businesses will fail during a given month?
In a suitable one-tail test at the 0.01 level, was the mean time for the Delta visits significantly less than that for the British Airway visits? Identify and interpret the p-value for the test.