Exam 26: Statistics and Data Analysis

A researcher is conducting a study to determine how knowledgeable teenagers are about making good food choices.She decides to interview teenagers eating at a fast food restaurant.The results may be biased because this is a ________________________ .

Suppose that a textile manufacturer finds is an average of 5.5 defects per 100 square foot sections of carpet as part of its quality assurance program.An appropriate control chart to use for these data is 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 null and alternative hypotheses are ________________________ .

The U.S.Bureau of Labor Statistics publishes the monthly CPI (consumer price index).This index shows the change in prices paid by urban consumers for a market basket of goods and services.These data are

We have created a 95% confidence interval for µ with the result (10, 15).What conclusion will we make if we test : µ = 16 versus H_A : µ ≠ 16 at α = 0.05?

One ball is removed from a bag containing 1 blue ball, 1 red ball, 1 yellow ball, and 1 green ball.Without returning the first ball to the bag a second ball is removed.Determine whether the events are disjoint, independent, complimentary, all or none of these.

The following payoff table (in thousands of dollars) considers three possible levels of demand in a housing complex.If there is a 45% chance that the demand level will be low, 30% that it will be medium and 25% chance that it will be high, the expected value (in thousands of dollars) associated with the best action is ________________________ .

Light bulbs are measured in lumens (light output), watts (energy used), and hours (life).A standard white light bulb has a mean life of 675 hours and a standard deviation of 50 hours.A soft white light bulb has a mean life of 700 hours and a standard deviation of 35 hours.At a local science competition, both light bulbs lasted 750 hours.Which light bulb's life span was better?

A real estate agency, located in a metropolitan area in the northeastern U.S., kept data on the various types of properties purchased in the area.Historically, 15% of purchases were for condominiums, 30% were for townhouses, 40% for single family homes, 10% for commercial properties and 5% for land.Based on the data shown below, the null hypothesis was rejected and the agency concluded that the current distribution of property sales differs from the historical distribution.Based on an examination of the standardized residuals, which type of property had the most impact on the test results?

A government agency has 6000 employees.As an alternative to the traditional five day work week, employees were asked whether they preferred a four day work week (10 hours per day) or flexible hours.The table below shows the results by age category. The most appropriate display for these data is a

Assume that a set of test scores in an Introduction to Finance class is normally distributed with a mean of 72 and a standard deviation of 8.Use the 68-95-99.7 rule to find the percentage of scores between 80 and 96.

A human resources manager at a large company wants to estimate the proportion of employees that would be interested in reimbursement for college courses.If she wishes to be 95% confident that her estimate is within 5% of the true proportion, how many employees would need to be sampled?

A recent survey of online shoppers asked them to indicate the primary reason they shop via the Internet.The table summarizes responses by reason and gender.What percent of respondents cite Convenience as the primary reason they shop online?

An office supply chain has stores in two locations, Dayton and Scranton.One of these stores is to be closed within the coming year, and to help make the decision, management reviews sales data.Below are boxplots for monthly unit sales for both locations. Which of the following statement is not correct?

Referring to question #12, approximately how heavy would a male Golden Retriever be in order to be in the heaviest 5% of such dogs?

Which of the following measures is used to check for collinearity when building a multiple regression model?

Suppose that six different e-readers were evaluated by two senior citizen groups with respect to their suitability for use among the older segment of the population.The rankings from 1 (best) to 6 (worst) are shown below.Using the appropriate nonparametric method, the value of the calculated test statistic to determine if there is a difference in the rankings between the two magazines is ________________________ . GLOBAL : Please place the table above and answers below

College students were given three choices of pizza toppings and asked to choose one favorite.The following table shows the results. Given that a student's favorite topping is veggie, what is the probability that the student is a junior or a senior?

A business researcher conducted a survey of 500 women to determine preferences for types of automobiles.The types are shown below along with the number of women who prefer that type.Which of the following charts would be appropriate for displaying these data?

Assume that a set of test scores in an Introduction to Finance class is normally distributed with a mean of 72 and a standard deviation of 8.Use the 68-95-99.7 rule to find the percentage of scores less than 56.