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Construct a 96% confidence interval for the true mean breaking strength of a certain type of 10 ft. long cables. Assume that there are 100 such cables with mean = 457 lbs while the standard deviation of the population = 50 lbs. Also find the margin of error for the interval estimate.
a shipment of 30 tires arrived at a tire shop this past weekend and unknown to the manager eight of the tires are
A prison official wants to estimate the proportion of cases of recidivism. In examining 250 convicts there are 65 cases. with 99% confidence interval what is the range? How do you figure this type of problem?
A number of minor automobile accidents occur at various high-risk intersections. A study was done. Eight intersections were chosen at random. The number of minor accidents during a 6-month period before and after the modifications were:
We assume that we have selected two independent random samples from populations having proportions p 1 and p 2 and that p-hat 1 = 800/1000 and p-hat 2 = 950/1000
You have to determine that your cutoff value at level a = 0.05 is 1.645 when testing whether the mean of a population is significantly different from 1.5. If you calculate a test statistic of 1.8 what is the proper conclusion?
data from six students relating number of hours of preperation x and test score y yield a linear correlation
correlation between the two variables based on scatter plot.a store manager wishes to find out whether there is a
If a random sample of 10 people found that 9 were pro-life (i.e., 90%), while another random sample of 1000 people from the same population found that 550 were pro-life (i.e., 55%), which would you find more significant? Why?
describe the circumstances under which the shape of the sampling distribution of p-hat is
The class to get A's, 30% to bet B's, 30% to get C's, 15% to get D's and 10% F's. What would be the minimum and maximum scores required for each of these grades?
objectives1. demostate the use of appropriate tools for converting data into meaningful information.2. select defend
What is the standard deviation of the sampling distribution of the sample mean x if a sample of 64 students is selected at random from the entire freshman class?
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