Exam 26: Statistics and Data Analysis

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 lower and upper control limits for the R chart are ________________________ .

A customer service center keeps track of the number of complaints received each day about one of their new products.The numbers of complaints received over the last 11 day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25.The IQR for this sample of data is

A type II error is committed when ________________________ .

To investigate length of battery life while accounting for the device the battery lives in, an 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?

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.The centerline on the appropriate control chart for these data is ________________________ .

The results of a multiple regression model to predict the job performance of new hires based on age, GPA and gender (female = 1 and male = 0 are shown below.At Α = .05 we can conclude that ________________________ .

Using this regression equation: Salary = 37.2 + 1.49 Years' Experience to predict salary for pharmacists with 10 years of experience gives the following results.Which of the following is true?

The weather reporter predicts that there is a 20% chance of snow tomorrow for a certain region.What is meant by this phrase? One line space needed

The time series graph below shows monthly sales figures for a specialty gift item sold on the Home Shopping Network (HSN).The dominant component in these data is ________________________ .

Which statement about influential points is true?

A magazine that publishes product reviews conducted a survey of teenagers' preferences for cell phones.Three brands of cell phone designed specifically with teens in mind were the focus of the study.The table summarizes responses by brand and gender.What percent of teenagers preferred LG Rumor?

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 bleaching has an effect on fiber content is ________________________ .

The following scatterplot shows output/unit capital and years.The data show

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

After computing a confidence interval, the investigator believes that the results are meaningless because the width of the interval is too large.In reconstructing the interval, the investigator should ________________________ .

Suppose the time it takes for a purchasing agent to complete an online ordering process is normally distributed with a mean of 8 minutes and a standard deviation of 2 minutes.What is the probability that it takes longer than 11 minutes for the purchasing agent to complete the process?

Data were analyzed to see if income level (1 = Low, 2 = Middle, 3 = High) influence the amount consumers spend online for holiday shopping.Based on the ANOVA results shown below, the F statistic value is ________________________ .

Boxplots of earnings per share (EPS) data for a sample of retail company stocks and a sample of energy company stocks are shown below.Which of the following statements is correct?

In order to see which variety of apple tree produces more fruit, a farmer sets up an experiment.He has three plots of land with different soil and natural water availability.Each plot has room for eight trees.The farmer randomly selects four locations in each plot for the first variety of tree and the other four get the second variety.This experiment is ________________________ .

Because a medical experiment makes use of volunteers ________________________ .