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In a business class, 30% of the students have never taken a statistics class, 60% have taken only one semester of statistics, and the rest have taken two or more semesters of statistics. The profes
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on a 98% confidence level and state that the estimated proportion must be within 4% of the popu
Rob and Steve are having an archery contest: the goal is to shoot an arrow closest to the center of a target (the bull's eye). Let's model the target as R^2; the bull's eye is the origin
A survey of 35 randomly selected "iPhone" owners showed that the purchase price has a mean of $432 with a sample standard deviation of $145. a) Compute the standard error of the sample mean
A random sample of medical files is used to estimate the proportion p of all people who have blood type B.
Following the convention that the margin of error was based on a 95% confidence interval, find the 95% confidence interval for the percentage of the population that would respond "crime and violence
If we are very certain that the true standard deviation of the number of defects per screen is below 2, what sample size would be required so that the width of the 95% confidence interval for the me
The mean diameter of a ball bearing produced by a certain manufacturer is 0.80 cm with a standard deviation of 0.03 cm. A sample of 36 ball bearings is randomly selected from a production run. Answe
Suppose that the random point (X, Y) is uniformly distributed on a circle with radius r centered at the origin. Let R be the distance from the random point (X, Y) to the origin. So, R is a random va
Suppose that weights of American adult males is Normally distributed with mean 165 pounds and standard deviation 15 pounds. A random sample of 36 adult American males is obtained.
A health care facility is interested in monitoring the primary C-section rate. Monthly data on the number of C sections collected over the two and half years is shown below.
If an offspring ends up with either (R, R), (R, W) or (W, R), its eyes will look red. Let X be the number of offspring having red eyes and let Y equal the number of red-eyed offspring having (R, W)
An observation that does not fit the pattern of the rest of the data is called a(n)
In a poll conducted by the Nanos Research on May 1, 2011, 38.7% of n = 702 decided voters supported the Conservative. (a) Find a 95% confidence interval for p, the proportion supporting the Conservati
In order to be effective, reflective highway signs must be picked up by the automobile's headlights. To do so at long distances requires that the beams be on "high". A study conducted by highway eng
The Stewart Aviation Products Company has been successfully manufacturing aircraft al- timeters with errors normally distributed with a mean of 0 ft (achieved by calibration) and a standard deviatio
Assuming that Motorola follows a continuous review policy, what reorder point and safety inventory should the warehouse aim for when using sea or air transportation?
A companyis developing a new high-performance wax for cross country ski racing. In order to justify the price marketing wants to be very fast. spcifically, the mean time to finish their standard tes
Your estimator (the sample mean) is not an unbiased estimator of the population mean because your sampling method tends to pick people that take more sick days.
A machine produces parts with lengths that are normally distributed with ? = 0.55. A sample of 10 parts has a mean length of 76.05. a) Give a point estimate for ?. (Give your answer correct to two d
Determine the number of subgroups needed to establish the central lines and control limits for X and R charts with a subgroup size of 2 for a 8 -spindle filling machine. How many times in succession
Select the variable for the number of miles traveled last month. Conduct a test of hypothesis to determine whether the mean number of miles traveled is equal to 840. Use the .01 significance level.
Find the 95% confidence interval for the true mean decrease in the drying time based on this sample. (Give your answers correct to two decimal places.)
The pulse rates for 13 adult women were as follows. Construct a 0.90 confidence interval for the mean pulse rate. (Give your answers correct to one decimal place.) Give the Lower and Upper Limits.