Exam 26: Statistics and Data Analysis

The weights of soy patties sold by Veggie Burgers Delight are normally distributed.A random sample of 15 patties yields a mean weight of 3.8 ounces with a sample standard deviation of 0.5 ounces.At the 0.05 level of significance, perform a hypothesis test to see if the true mean weight is less than 4 ounces. The correct null and alternative hypotheses are ________________________ .

An army depot that overhauls ground mobile radar systems is interested in improving its processes.One problem involves troubleshooting a particular component that has a high failure rate after it has been repaired and reinstalled in the system.The shop floor supervisor believes that having standard work procedures in place will reduce the time required for troubleshooting this component.Time (in minutes) required troubleshooting this component without and with the standard work procedure is recorded for a sample of 19 employees.In order to determine if having a standard work procedure in place reduces troubleshooting time, they should use ________________________ .

A survey revealed that 45% of people are entertained by reading books, 46% are entertained by watching TV, and 9% are entertained by both books and TV.What is the probability that a person will be entertained by either books or TV?

A researcher notes that the weight of a male Golden Retriever is approximately normally distributed with a mean of 70 lbs.and a standard deviation of 7.5 lbs.What percentage of these dogs weigh less than 65 lbs? One line space needed

College students were given three choices of pizza toppings and asked to choose one favorite.The following table shows the results. Find P(favorite topping is meat | student is junior). One line space needed

Three wines (California, Australian and Italian) were tasted by a different group of judges as part of an annual food and wine festival.The judges graded the wines on overall quality (A = excellent to F = poor).The appropriate nonparametric procedure to determine differences in perceived quality is ________________________ .

Data are collected on the number of foreign visitors to a country (million) and total tourism revenue ($billion) for a sample of 10 countries.According to the following output, what is standard error of the slope for this estimated regression equation?

An army depot that overhauls ground mobile radar systems is interested in improving its processes.One problem involves troubleshooting a particular component that has a high failure rate after it has been repaired and reinstalled in the system.The shop floor supervisor believes that having standard work procedures in place will reduce the time required for troubleshooting this component.Time (in minutes) required troubleshooting this component without and with the standard work procedure is recorded for a sample of 19 employees.Assuming that we define our differences as Time without standard work procedure - Time with standard work procedure, the correct alternative hypothesis is ________________________ .

In a clinical trial, 780 participants suffering from high blood pressure were randomly assigned to one of three groups.Over a one-month period, the first group received a low dosage of an experimental drug, the second group received a high dosage of the experimental drug, and the third group received a placebo.The diastolic blood pressure of each participant was measured at the beginning and at the end of the period and the change in blood pressure was recorded.Identify the treatments.

Prices per share of the 20 most actively traded stocks on the New York Stock Exchange in October, 2012.A histogram for these data are shown below.The data can be described as ________________________ .

More dogs are being diagnosed with thyroid problems than have been diagnosed in the past.A researcher identified 50 puppies without thyroid problems and kept records of their diets for several years to see if any developed thyroid problems.This is a(n) ________________________ .

A Durbin Watson statistic calculated on a regression model has a value of 0.279.This indicates that the ________________________ .

A manufacturer of cordless electric shavers sampled 13 from a day's production and found the mean time of continuous usage without recharging to be 410 minutes with a sample standard deviation of 30 minutes.We can assume that times are normally distributed.We wish to test if the true mean operating time without recharging is more than 400 minutes.The correct calculated value of the test statistic is ________________________ .

Which factor listed below does not affect the power of a test?

Three wines (California, Australian and Italian) were tasted by a different group of judges as part of an annual food and wine festival.The judges graded the wines on overall quality (A = excellent to F = poor).The calculated value of the statistic for the appropriate nonparametric test to determine differences in perceived quality is ________________________ .

A recent report evaluated the price and performance of 25 models of smartphones.Computer output gives the summary statistics for the prices ($) shown in the table. The IQR for these data is

As a preliminary step in its product testing, a fast food chain has two small groups (4 teenagers, 6 older adults) sample the item and "grade" it on "taste." Ratings were grades A to C (including + and -).What nonparametric method is appropriate to determine if the two groups differ in opinion?

Suppose a sample of 60 cans of soda has a mean of 12.1 ounces and a standard deviation of 0.05 ounces.If a can of soda has 12 ounces, what is its corresponding z score?

In a clinical trial, 780 participants suffering from high blood pressure were randomly assigned to one of three groups.Over a one-month period, the first group received a low dosage of an experimental drug, the second group received a high dosage of the drug, and the third group received a placebo.The diastolic blood pressure of each participant was measured at the beginning and at the end of the period and the change in blood pressure was recorded.Identify the factor in the experiment.

A major customer for a vendor of plastic containers requires that its containers have a volume of 10,000 cubic inches with a tolerance of 50 cubic inches.Forty subgroups of five containers each were selected periodically from the production process.The average of the means across all subgroups was found to be 10,012 cubic inches and the average range was 48 cubic inches.The estimated process standard deviation () is ________________________ .