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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.
A random sample of 225 SAT scores has a mean of 1500. Assume that SAT scores have a population standard deviation of 300. Construct a 95% confidence interval estimate of the mean SAT scores. Show wo
A random sample of STAT200 weekly study times in hours is as follows: 4 14 15 17 20 a. Find the standard deviation.
We can assume that times are normally distributed. We wish to test if the true mean operating time without recharging is more than 400 minutes.
A bakery has an average daily expense of $1350. The standard deviation is $150. The owner takes a sample of 50 bills, what is the probability the mean of his sample will be between $1200 and $1500?
Determine the appropriate approach to conduct a hypothesis test for this claim: The systolic blood pressure of men who run at least five miles each week varies less than does the systolic blood pres
Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle department has been found to be normally distributed with a mean of 30 minutes and a standard dev
How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02 (to the nearest whole number)? Use 95% confidence.
The Human Resources Department believes that women tend to take more personal time than men because they tend to be the primary child care givers in the family. Write the null and alternative hypoth
A random sample of 90 students at a private high school is tested and and a mean SAT score of 1030 is obtained. The average score for public high school student is 1000 (σ= 200). Is this a on