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In recent years, the interest rates on home mortgages have declined to less than 6%. However, a recent study shows that the rate charged on credit card debt is more than 14%. A sample of 10 credit cards showed that the mean rate charged is 15.64% with a standard deviation of 1.561%. At 1% level of significance, is it reasonable to conclude the mean rate charged is greater than 14%?
Fertilization of bromeliads, continued. Repeat the analysis of Exercise 29.42 using change in the number of leaves as the response variable.
If you multiply each score in the distribution by 3 what is the standard deviation of the new distribution?
a lot of 100 semiconductor chips contains 20 that are defective. three are selected at random without replacement from
The mean SAT verbal score is 412, with a standard deviation of 90. Use the Empirical Rule to determine what percent of the scores lie between 412 and 592.
What is the probability that 5 of the next 15 customers will purchase a new car?
What fraction of the variation in salaries can be explained by the fact that some employees are older than others?
Note that this restricts the range of X values. Without looking at the data, can you predict whether Pearson's correlation will increase or decrease after these points are removed?
If the base of an N-story building is allowed to rotate against a resisting spring KB. as shown in Fig. P9.39, determine the boundary equations
(a) Find the 95% confidence interval for the average monthly comprehensive car insurance premium paid by all owners of medium-sized cars. Interpret the result. (Use the z-table.) (b) Find the 90% confidence interval for the same problem. Interpret ..
A random sample of 100 students who took a statistics exam were asked their score on the exam. The mean score on the test was 50; the standard deviation was 10. The scores are normally distributed.
Approximately normally distributed with a mean of 32 hours and a standard deviation of 2 hours. What percent of the garages take between 30 and 34 hours to erect?
in a study on infants one of the characteristics measured was head circumference. the mean head circumference of 14
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