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Prices for regular unleaded gasoline can vary widely from day to day and location to location. These data were obtained on June 1, 2001, from a sample of stations across the respective state (price is in dollars per gallon):
South Carolina: 1.46 1.47 1.42 1.51 1.55 1.52 1.48 1.47 1.53 1.50
Michigan: 1.69 1.79 1.72 1.76 1.80 1.59 1.89 1.72 1.63 1.55 1.91 1.92
A) Use these data to test for equality of variances.
B) What is the P value of your test and what conclusion do you draw?
what is the distribution of the case described here? mr. hr hits a homerun in his turn at a baseball game with 5 of
Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the 0.05 significance level, can we conclude that the mean waiting time is less than three minutes?
What are the differences among a proportion, a percentage, and a ratio? When would a researcher use a hypothesis test for the difference in two population proportions? Explain.
during the 3pm to 5pm time period cars arrive at a banks drive through window at an average rate of 15 customers per
Our bodies have a natural electrical field that is known to help wounds heal. Does changing the field strength slow healing? A series of experiments with newts investigated this question.
The standard deviation is 4. what is the best point estimate of the mean? find the 95% confidence interval of the mean score for golfers.
Sam Sleep researcher hypothesizes that people who are allowed to sleep for only four hours will score significantly lower than people who are allowed to sleep for eight hours on a management ability test.
Random sample with a normal distribution with a mean of 60,000 and standard deviation of 2300. What warranty should the company us if they want 96% of the tires to outlast the warranty?
a researcher wishes to compare the effect of the rate of stepping on heart rate in a step-aerobics workout. a
Let x be a random variable that represents the commute time of teachers in a large urban area. If x is normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes, find the commute time which is at the top of the bottom 25..
You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenien..
Past studies have shown that only 95% of booked passengers actually show up for the flight. What is the probability that exactly 99 booked passengers actually show up for the flight?
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