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Historical data suggests a standard deviation in the first sample of 10 and a standard deviation in the second sample of 16. Find a 95% confidence interval for the population difference.
A scientist wishes to find the 98% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to be accurate within 10 peaches per tree?
In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at an auto repair shop take per year. A previous study indicated that the standard de
Four buses carrying 151 high school students arrive to Montreal. The buses carry, respectively, 37, 41, 27, and 46 students. One of the studetns is randomly selected. Let X denote the number of stud
Plot CEO salaries against the net profit of their respective companies, do you expect to find a linear correlation between the two?
If a business researcher has a new theory about buying habits of consumers and wants to test it, the new theory usually is formulated into the:
You have been offered hundreds of the same business deals. For each you estimate that there is a 1% chance of making $100,000; 4% chance of making $40,000; a 20% chance of making $10,000; and 75% ch
What is the 95% confidence interval for the proportion of the population of employees who strongly dislike their current work experience?
Find the probability of getting at least 127 boys among 152 babies. Does the result suggest that the YSORT method is effective? Why or why not?
Suppose that a company claims that their mean weekly sales are $12,250. Find the critical values for the hypothesis test. Assume that the significance level is a = 0.05.
A pilot survey reveals that 5 of the 50 sampled hold two or more jobs. How many in the workforce should be interviewed to meet your requirements?
A correctional institution would like to report the mean amount of money spent per day on operating the facilities. How many days should be considered if a 95 percent confidence is used and the esti
If 5 players are chosen randomly what is the probability that all 5 are basketball players? If the players are to be arranged in a line, how many arrangements are there if the basketball players are
Workers in the production department are able to produce an average of 200 units per person per day with a standard deviation of 20 units. in order to raise the productivity some more, management an
Assuming the lifetime of the batteries is normally distributed; determine the number of days that at least 95% of the batteries will last beyond.
Based on a random sample of 2,500 people, the estimates of people by age group unemployed in one Northern city are found in the table:Is the study descriptive or inferential?
150 said that they pay bills online. At the 5% level of significance, test whether the proportion of internet users paying bills online is now more than 50%.
A newspaper publisher mails out a survey 6 months before a subscription expires. This survey asks its subscribers if they are going to renew. On average, 8% of the subscribers respond to the survey.
In a shipment of 57 vials, only 17 do not have hairline cracks. 6 vials are randomly selected from the shipment. Find the probability that 4 of the selected vials have hairline cracks.
At the 0.05 level of significance, test whether the software package has reduced the average time it takes to complete deliveries.e.
53% of men consider themselves professional baseball fans. you randomly select 10 men and ask if he considers himself a professional baseball fan. Find the probability that the number who consider t
If you accept Christ, you have a 10% probability of earning $100 if God exists, and a 90% probability of earning $10 if there is no God, which gives an expected value of: (0.10)($100) + (0.90)($10)
Evergreen Fertilizer Company produces fertilizer. The company's fixed monthly cost is 25000 and its variable cost per pound of fertilizer is .15. Evergreen sells fertilizer for .40 per pound. Determ
Determine whether there are any preferences among four brands of cola. With alpha = .05 and a sample of n = 30, what is the boundary for the critical region for the hypothesis test.
The probability that merchandise stolen from a store will be recovered is 15%. Suppose a random sample of 8 stores, from which merchandise has been stolen, is chosen. Find the mean μ of this prob