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It is reported that the 33 percent of American households employ a cell phone exclusively for their telephone service. In the sample of fourteen households, determine the probability that:
Determine the area under the standard normal curve to right of z = -1.25.
The data below are the final exam scores of 10 randomly chosen statistics students and the number of hours they studied for the exam. Determine the equation of the regression line for the given data
The national median sales price for new single-family homes is $230,000 (The Associated Press, March 25, 2006). Assume that the following data were obtained for sales of existing single-family homes
Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that watches have an average life of 29 months before certain electronic components deteriorate, causing the w
The Packaging Company produces boxes out of cardboard and has specified weight of 12 oz. A random sample of 32 boxes cans yielded the sample mean of 11.3 oz. Given standard deviation is 1.1 oz, giv
Assume we want to find out the (binomial) probability(p) of getting 4 heads in 15 flips of a 2-sided coin. Using the Binomial Probabilities Table in Appendix B of the text, what values of n, x and p
A sociologist is desires to determine the mean age at which students graduate. Previous studies indicate that the standard deviation of these ages was 3.4 years.
Determine the approximate width of a 90% confidence interval for the true population proportion if there are 12 successes in a sample of 25?
A company desires to determine the time its trucks take to drive from city A to city B. Suppose that the standard deviation is known to be 12 minutes. Determine the sample size required in order tha
A highway inspector needs an determine of the mean weight of trucks crossing a bridge on the Interstate highway system. She selects a random sample of 49 trucks and finds a mean of 15.8 tons with a
What is the approximate width of a 90% confidence interval for the true population proportion if there are 12 successes in a sample of 25?
A university wants to determine the average distance that commuter students travel to get to class with an error of ±3 miles and 90 percent confidence. What sample size would be needed, assum
A financial institution wishes to determine the mean balances owed by its credit card customers. The population standard deviation is estimated to be $300. If a 99 percent confidence interval is use
Oxnard Beneficial Insurance desires to estimate the cost of damage to cars due to accidents. The standard deviation of the cost is estimated at $200. They want to estimate the mean cost using a 95%
Determine the equation of the regression line for the given data. Predict the value of Y when X=-2. Predict the value of Y when X=4.
Compute the Pearson correlation. With a small sample, a single point can have a large effect on the magnitude of the correlation. Change the score X = 5 to X = 0 and compute the Pearson correlation
The Genetics and IVF Institute conducted a clinical trial of the YSORT technique designed to raise the probability of conceiving a boy. As of this writing, 152 babies were born to parents using the
Suppose that the probability that the Phillies will win in the playoffs Phillies remains 0.55, and the winner is decided by the winning three out of five games. One more time the Phillies will face
A food stand has a single server. Customers arrive to stand a rate of per hour according to the Poisson Distribution. Service times are exponentially distributed with mean service time of 2 minutes
Birth weights in US are normally distributed with mean of 3800g and standard deviation of 500g. If the hospital plans to set up special observation situations for the lightest 5% of babies, what wei
A clinical trial is run to determine the effects of different forms of regular exercise on HDL levels in persons between the ages of 18 and 29.
The peak shopping time at the pet store is between 8:00am and 11:00am on Saturday mornings. Management at pet store randomly chosen 30 customers last Saturday morning as well as decided to observe t
Parking at the large university has become a extremely big problem. University administrators are interested in estimating the average parking time (e.g. the time it takes a student to find out a pa
Parking at the large university has become the very big problem. University administrators are interested in estimating the average parking time (e.g. the time it takes a student to find a parking s