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In order to encourage social distancing, stores are limiting the number of customers entering their premises at any one time. This practice often results in customers waiting in line outside the store before being allowed to enter. A random sample of 47 stores finds that the average waiting time for a customer to enter a store is 14.2 minutes with a standard deviation of 6.4 minutes.
Based on this data, construct a 95% confidence interval estimate for the true amount of time that a customer should expect to wait in line before being allowed to enter a store.
State your answers to two decimal places.
Polygraphs. Lie detectors are controversial instruments, barred from use as evidence in many courts. Nonetheless, many employers use lie detector screening.
Batting averages. Suppose that a baseball player's long-run batting average (number of hits per time at bat) is 300. Assuming that each time at bat yields.
Two researchers make a test concerning the same hypothesis. Researcher A tests her hypothesis at a .05 level of significance ( a=.05 ); Researcher B tests
Draw a normal probability distribution (bell curve) on a piece of paper and mark the center line (mean). (no need to send me the sketch-just tell me your answer.
Find the predicted value and the residual. Another individual in the NEA data set has NEA increase equal to 143 calories and fat gain equal to 3.2 kg.
If a table of expected frequencies differs very little from the frequencies that were observed, would the cal- culated chi-square be large or small? Why?
Politics. A candidate for office claims that there is a correlation between television watching and crime. Criticize this statement on statistical grounds.
Does British political culture reflect Europe or is it as its people often argue unique to itself? Explain your answer.
The city council of Pine Bluffs is considering increasing the number of police in an effort to reduce crime. Before making a final decision,
A city employee locates a U.S. Census report that includes the mean and standard deviation for income in the state of Wyoming and then takes a random sample.
Approximate the 50th percentile for X, the percentage ash content for a particular variety of moss using the data.
(a) Let p represent the proportion of all medical doctors who have a solo practice. Find a point estimate for p. (Use 3 decimal places.)
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