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Question: Students' earnings. The financial aid office of a university asks a sample of students about their employment and earnings. The report says, "For academic year earnings, a significant difference (P = 0.028) was found between the sexes, with men earning more on the average. No difference (P = 0.576) was found between the earnings of black and white students." Explain both of these conclusions, for the effects of sex and of race on mean earnings, in language understandable to someone who knows no statistics.
NASA is planning many Mars missions with rover vehicles. A typical rover is a solar-powered vehicle which will see where it is going with TV cameras and will measure distance to objects with laser range finders.
A factory machine cuts metal wire into strips. The length of the strips is known to follow a normal distribution with the mean of 10 cm and variance of 9 cm2.
three students scheduled interviews for summer employment at the brook wood institute .in each case the interview
Time it took then to change a water pump was 18 minutes. The SD of the sample was 3. Find the 99% of the interval of the true mean.
a pkiggy bank contains 4 quarters 3 dimes 8 nickles and 9 pennies. what is the probability of randomly selecting a
A retailer wants to estimate with 99% confidence the number of people who buy at his store. A previous study showed that 15% of those interviewed had shopped at his store.
A random sample of 21 nickels measured with a very accurate micrometer showed a mean diameter of 0.834343 inches with a standard deviation of 0.001886 inches. Why would nickeldiameters vary
according to a hospital administrator historical records over the past 10 years have shown that 20 percent of the major
For a normally distributed random variable with mean -44 and standard deviation 16, find the probability that the value of the random variable will be above 0.
What characteristics or history enabled the Persian Empire to gain so much power? To prepare your answer, consider how the Empire differed from previous major powers and the problems that it faced.
Construct a 99% confidence interval estimate of the population mean amount of paint in a 1-gallon can.
Find the five-number summary for Group 1.- Find the five-number summary for Group 2.- Compare the values of the range for the two groups.
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