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Assume that a sample of 62 students was selected (with the same mean and the standard deviation). Provide a 95% confidence interval estimate for the average number of hours that all college freshmen
A sample of 121 cars traveling on the highway revealed an average speed of 60 miles per hour with a standard deviation of 11 miles per hour. Determine a 95% confidence interval estimate for the spee
Computer Services, Inc. wants to determine a confidence interval for the average CPU time of their teleprocessing transactions. A sample of 64 transactions yielded a mean of 6 seconds with a standar
what size sample would be required to estimate the proportion of unemployed college students if we want the margin of error not to exceed 3 percent?
Six hundred consumers were asked whether they would like to purchase a domestic or a foreign automobile. Their responses are given below.
An Excel printout of the descriptive measures of daily checking account balances (in dollars) of customers of First Daisy Bank is shown below. Develop a 95% confidence interval estimate for the mean
Information regarding the price of a roll of camera film (35 mm, 24 exposure) for a sample of 12 cities worldwide is shown below. Determine a 95% confidence interval for the population mean.
A small stock brokerage firm wants to determine the average daily sales (in dollars) of stocks to their clients. A sample of the sales for 36 days revealed average daily sales of $200,000. Assume t
A random sample of 81 children with working mothers showed that they were absent from school an average of 6 days per term with a standard deviation of 1.8 days. Provide a 95% confidence interval fo
A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00. Determine the standa
Determine a 95% confidence interval estimate for the mean weight of the carry-on luggage.
The manager of a department store wants to determine what proportion of people who enter the store use the store's credit cards for their purchases. What size sample should he take so that at 95% co
If the sample mean is 2,000 KWH, what is the 95% confidence interval estimate of the population mean?
A local university administers a comprehensive examination to the recipients of a B.S. degree in Business Administration. A sample of 5 examinations is selected at random and scored. The scores are
If the population standard deviation of the lifetime of washing machines is estimated to be 900 hours, how large a sample must be taken in order to be 97% confident that the margin of error will not
Construct a 95% confidence interval estimate for the percentage of spring semester students who will return to summer school.
What is the point estimate for the proportion of people who liked the chocolate bar?
A hospital in a large city records the weight of every infant born at the hospital. the distribution of weights is normally shaped, has a mean = 2.9 kg, and has a std. dev. =0.45.
A researcher wants to know the average height of trees in a plot of land. The researcher randomly samples 18 trees, and finds that the average height is 4.7 meters with a standard deviation of 0.32
Calculate the mean deviation form (1) arithmetic mean (2) median (3) mode in respect of the marks obtained by nine students gives below and show that the mean deviation from median is minimum.
If license plates are issued at random from all possible plates, what is the probability that Jerry will get a plate that ends in AAA?
A sample of 4 telephones is selected from a shipment of 20 phones. There are 5 defective telephones in the shipment. How many of the samples of 4 phones do not include ny of the defective ones?
(Binomial distribution) a large firm allows a discount on any invoice that is paid within 90 days. of all invoices, 10% recieve the discount. in a company audit, 12 invoices are sampled at random. w
Exercise to reduce stress: A survey by mens health magazine stated that 14% of men said they used exercise to reduce stress. At a = 0.10, test the claim that a random sample of 100 men was selected
The outcome is patient's self-reported effect of treatment. The data are shown below. Are symptoms independent of treatment? Conduct a ChiSquare test at a 5% level of significance.