The mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey 8 employees. The number of sick...
the mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey B employees. The number of sick days that the mean number is about 107 Conduct a hypothesis test at the 5% level. they took for the past year are as follows: 12; 6; 14 5 11; 6;10. Lt X the number of sick days they took for the past year....
The mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey 8 employees. The number of sick days they took for the past year are as follows: 10; 6; 14; 4; 10; 9; 8; 9. Let X = the number of sick days they took for the past year. Should the personnel team believe that the mean number is about 10?...
1. The mean number of days it takes an employer to approve medical leave is believed to be about ten. Members of a collective bargaining unit do not believe this figure. They randomly survey eight employees. The number of days they took to approve medical leave are as follows: 12; 4; 15; 3; 11; 8; 6; 8. Let X = the number of days the employer took to approve medical leave. (a) Identify a null and alternative hypothesis. (b) Determine...
You need to estimate the mean number of travel days per year for salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 32 days. If you must estimate the population mean within 5 days, how many salespeople should you sample? Use the 95% confidence level. (Use z Distribution Table.) (Round your answer to the next whole number.) Number of outside salespeople
You need to estimate the mean number of travel days per year for salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 48 days. If you must estimate the population mean within 12 days, how many salespeople should you sample? Use the 98% confidence level. (Use z Distribution Table.) (Round your answer to the next whole number.)
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 42 days. If you must estimate the population mean within 8 days, how many outside salespeople should you sample? Use the 95% confidence level. (Use z Distribution Table.) (Round up your answer to the next whole number.) Number of outside salespeople
A particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs to be replaced. From past studies of this tire, the standard deviation is known to be 8,000. A survey of owners of that tire design is conducted. Of the 32 tires surveyed, the mean lifespan was 46,600 miles with a standard deviation of 9,800 miles. Using alpha = 0.05, is the data highly consistent with the claim? Note: If you are using...
You are interested in finding a 90% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 12 randomly selected college students. Round answers to 3 decimal places where possible. 12 3 5 0 12 5 0 12 10 11 3 4 a. To compute the confidence interval use a ? z t distribution. b. With 90% confidence the population mean number of days of...
1. The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 209 residents whose mean number of pounds of trash generated per person per week was 34.5 pounds and the standard deviation was 7.5 pounds. Round answers to 3 decimal places where possible a.With 90% confidence the population mean number of pounds per person per week is between ___...
you need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 36 days. If you must estimate the population mean within 10 days, how many outside salespeople should you sample? Use the 95 percent confidence level. (Round up your answer to the next higher whole number.) Number of outside salespeople