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Refer to the Buena School District bus data.
a. Find the median maintenance cost and the median age of the buses. Organize the data into a two-by-two contingency table, with buses above and below the median of each variable. Determine whether the age of the bus is related to the amount of the maintenance cost. Use the .05 significance level.
b. Is there a relationship between the maintenance cost and the manufacturer of the bus? Use the breakdown in part (a) for the buses above and below the median mainte- nance cost and the bus manufacturers to create a contingency table. Use the .05 sig- nificance level.
c. Use statistical software and the .05 significance level to determine whether it is rea- sonable to assume that the distributions of age of the bus, maintenance cost, and miles traveled last month follow a normal distribution.
How would you characterize the theatre lobby as far as its potential for audience socializing before and after the show and during intermission(s)?
What is the probability that the total weight of eight people exceeds 1300 pounds? 1500 pounds? (Assume that the probability distribution is approximately normal).
Formulate the appropriate null and alternative hypotheses to test the manufacturer's belief. Using the sample mean of 99.2, compute a 90% confidence interval. Show the computation, and interpret in one sentence the interval you compute.
Find the weighted mean if each three-hour course counts for 18%, and each four-hour course counts for 23% of her final semester score.
A large internet retailer is studying the lead time (elapsed time between the time when the order is placed and the time it is filed). The table below gives the lead times (in days) for a random sample of recent orders.
Based on a survey conducted on the DietSmart.com web site, investigators concluded that women who regu- larly watched Oprah were only one-seventh as likely to crave fattening foods as those who watched other daytime talk shows (San Luis Obispo Tr..
When a 99% confidence interval is calculated instead of a 90% confidence interval with n being the same, the margin of error will be
The mean time to complete a construction project is 52 weeks with a standard deviation of 3 weeks. Assuming the probability of completing the project follows a normal distribution, what is the probability of completing the project between 56 week..
If he selects the three brands at random, what is the probability that he will select the following?
Rob earns $50,000 per year. The mean salary for engineers with less than 5 years experience is $60,000 with a standard deviation of $5000. What is the Z value of Rob?
a sample of sales records for jmk shows the average revenue per day is 4275 with a standard deviation of 720 following
Do the data provide sufficient evidence to conclude that the cream will improve the skin of more than 50% of women? Test using α=0.05 and the p-value method.
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