Exam 26: Statistics and Data Analysis

The following scatterplot shows monthly sales figures (in units) and number of months of experience on the job for a sample of 19 salespeople.Estimate the correlation.

Data were collected for a sample of 12 pharmacists to determine if years of experience and salary are related.Based on the results below, the calculated t-statistic to test whether the regression slope is significant is ________________________ .

A company that processes wheat varies the milling time (short, medium and long) and bleaching (no bleaching and bleaching) and measure fiber content (gms/100 grams) of the resulting wheat product to determine the best combination for a desirable wheat product.According to ANOVA results below, the F statistic for testing whether milling has an effect on fiber content is ________________________ .

A North American mole weighs an average of 3.5 oz.with a standard deviation of 0.9 oz.and a distribution that is approximately normal.In what percentile is the weight of a mole that weighs 4.25 oz.?

Based on the actual and forecasted returns shown below, the MAD is ________________________ .

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.What is the probability that an employee at this government agency prefers a four day work week?

A consumer research group investigating the relationship between the price of meat (per pound) and the fat content (grams) gathered data that produced the following scatterplot.The residual of the point ($2.00 per pound, 6 grams of fat) is

A P-value indicates ________________________ .

Suppose that over the last 20 weeks, a law firm had a total of 1045 consultation calls, and that 126 of them did not get an appointment for an initial consult within 24 hours.An appropriate control chart to use for these data is the ________________________ .

In data mining, which of the following is an example of a transactional variable?

A manufacturing process has a 70% yield, meaning that 70% of the products are acceptable and 30% are defective.If three of the products are randomly selected, find the probability that all of them are acceptable.

An advocacy group is investigating whether gender has an effect on job category in large investment firms.She surveyed a sample of firms with the following results: What is the probability that a randomly selected employee's job category is executive / managerial given that she is female? One line space needed

The number of claims for lost luggage in a small city airport averages nine per day.Assuming the Poisson distribution, what is the probability that there will be fewer than 3 claims on any given day? One line space needed

What scale of measurement is type of workplace injuries (slip and fall, stress related, etc.)?

A researcher is conducting a study on eating disorders.Using a list of recent participants in the online Weight Watchers program, she randomly selects a name from the alphabetized list.She then chooses every tenth person from that point on to include in her study.This sampling strategy is called ________________________ .

The experiment is run once for each combination of brand of AAA batteries and device (TV remote, hand-held game, flashlight and digital camera).The twelve runs are ordered randomly.The time (in minutes) that each battery lasts under continuous usage is recorded.Which of the following statements is true about this design?

The residual, or the difference, between the observed frequency and the expected frequency is a reliable indicator.A standardized residual can also be computed for each cell.Which statements are true about standardized residuals?

In a blood testing procedure, blood samples from 5 people are combined into one mixture.The mixture will only test negative if all the individual samples are negative.If the probability that an individual sample tests positive is 0.12, what is the probability that the mixture will test positive? One line space needed

In economic downturns, companies attempt to downsize their workforces by offering early retirement incentives to older employees.A survey of 723 companies found that 195 engage in such downsizing practices.The 99% confidence interval for the proportion of companies that downsize their workforces by offering early retirement incentives is ________________________ .

Suppose that six different e-readers were evaluated by two senior citizen consumer groups using rankings from 1 (best) to 6 (worst).To determine if there is a difference in the rankings between the two magazines, the appropriate nonparametric method is the ________________________ .