Bank B, customers may enter any one of three different lines that have formed at three teller windows. Answer the following questions. Bank A 6.6 5.4 6.7 5.7 6.8 6.2 Bank B 6.3 4.1 7.1 6.7 Construct a 95% confidence interval for the population standard deviation o at Bank A. min

In 2007, the United States experienced the biggest jump in food prices in 17 years (The Wall Street Journal, April 1, 2008). A variety of reasons led to this result, including rising demand for meat and dairy products in emerging overseas markets, increased use of grains for alternative fuels, and bad weather in some parts of the world. A survey compared prices (in $) of selected products at grocery stores in the Boston area. The accompanying table shows the results. Item Crosby’s Shaw’s Market Basket Two-liter Coke   1.79 1.59   1.50 Doritos chips   4.29   4.99   3.50 Cheerios cereal   3.69   2.99   3.00 Prince spaghetti   1.59   1.69   1.99 Skippy peanut butter   5.49   4.49   3.99 Cracker Barrel cheese   4.99   4.99   3.49 Pepperidge Farm white bread   3.99   3.99   3.99 Oreo cookies   4.69   3.39   3.00 One dozen eggs*   2.49   2.69   1.59 Coffee*   4.49   4.79   3.99 Gallon of milk*   3.69   3.19   1.59 In a report, use the sample information to…

A Pew Internet Project Data Memo presented data comparing adult gamers with teen gamers with respect to the devices on which they play. The data are from two surveys. The adult survey had 1063 gamers, while the teen survey had 1064 gamers. The memo reports that 54% of adult gamers played on game consoles (Xbox, PlayStation, Wii, etc.), while 89% of teen gamers played on game consoles.   (a) Refer to the table that appears at the beginning of this section (page 344). Fill in the numerical values of all quantities that are known. (b) Find the estimate of the difference between the proportion of teen gamers who played on game consoles and the proportion of adults who played on these devices. (c) Is the large-sample confidence interval for the difference in two proportions appropriate to use in this setting? Explain your answer.

Office-chair racing is now an official sport in Japan. Teams of 3 race around a 200-meter circuit for 2 hours to see who can complete the most laps. Tonya, an office-chair racing coach, contacts the top 5 teams and randomly assigns them to complete a practice race using one of two popular brands of office chair: Brand A and Brand B. In a different time period, the same teams complete a practice race using the opposite brand of chair. Here are the data: A 2-column table with 5 rows. Column 1 is labeled Brand A with entries 116, 107, 101, 97, 94. Column 2 is labeled Brand B with entries 114, 102, 100, 94, 90. Calculate the mean difference (Brand A – Brand B) and the standard deviation of the differences.

Each year forbes ranks the world’s most valuable brands. A portion of the data for 82 ofthe brands in the 2013 forbes list is shown in Table 2.12 (forbes website, february, 2014).The data set includes the following variables:brand: The name of the brand.Industry: The type of industry associated with the brand, labeled Automotive& Luxury, Consumer Packaged Goods, financial Services, Other, Technology.brand Value ($ billions): A measure of the brand’s value in billions of dollarsdeveloped by forbes based on a variety of financial information about the brand.1-Yr Value Change (%): The percentage change in the value of the brand over theprevious year.brand Revenue ($ billions): The total revenue in billions of dollars for the brand.a. Prepare a crosstabulation of the data on Industry (rows) and brand Value ($ billions).Use classes of 0–10, 10–20, 20–30, 30–40, 40–50, and 50–60 for brand Value($ billions).b. Prepare a frequency distribution for the data on Industry.

A popular summer event is Skee-Ball. For $2, a customer purchases three balls and attempts to roll each ball into a central target. The customer wins their $2 back and wins an additional $1 if they hit the target once, an additional $3 if they hit the target twice and an additional $5 if they hit the target three times. If the customer does not hit the target at all, they lose their initial $2. Access the data set labeled ”Skee-Ball” which reports the outcomes of 2,500 games for a single day’s operation of a Skee-Ball booth. (a) Define a random variable C (Customer Score) equal to the number of times a customer hits the target in each set of three rolls. How many possible outcomes of C are there? Report your answer as an integer. (b) Report the net profit ($) that the Skee-Ball booth achieved for the day. Report your answer as an integer. Hint: Estimate the PDF of C based on the relative frequencies: P(C = c) = Frequency of C = c / 2,500 (c) Report P(C = 0). Round your answer to three…

uppose Laura, a facilities manager at a health and wellness company, wants to estimate the difference in the average amount of time that men and women spend at the company's fitness centers each week. Laura randomly selects 13 adult male fitness center members from the membership database and then selects 13 adult female members from the database. Laura gathers data from the past month containing logged time at the fitness center for these members. She plans to use the data to estimate the difference in the time men and women spend per week at the fitness center. The sample statistics are summarized in the table. Population Populationdescription Population mean(unknown) Samplesize Sample mean(min) Sample standarddeviation (min) 1 male ?1 ?1=13 ?⎯⎯⎯1=132.5 ?1=45.3 2 female ?2 ?2=13 ?⎯⎯⎯2=108.7 ?2=31.1   df=21.256 The population standard deviations are unknown and unlikely to be equal, based on the sample data. Laura plans to use the two-sample ?-procedures to estimate the…

Describe the structure of the data. Is it different than data you have examined before? Specifically, there are 24 rows in this data set, but the set provides information about 4,526 observations (the sum of the "count" column). Describe what each row represents. Each of the six departments (A-F) have four rows of data in this set corresponding to each of the following. 1st row Males who were admitted 2nd row Males who were not admitted 3rd row 4th row Females Females Of the 4,526 applicants in this data set, 1,755 were admitted for an overall admission rate of approximately 39%. The admission rate for males was 45%, while the admission rate for females was 30%. Complete the following table using Section 3 in the Tutorial or by adding up the counts by hand for each category. (For example: add up all counts where Admission = 1 and Sex = 1 to get the number of males who were admitted.) Sex Number Admitted Male Female who were admitted who were not admitted 1198 557 Number Rejected 1493…

If a data set contains three groups that each have ten people in them, how many rows will the “data view” have?     30     3     100     10

A retailer wants to see if a red "Sale" sign brings in less revenue than the same "Sale" sign in blue. The data below shows the revenue in thousands of dollars that was achieved for various days when the retailer decided to put the red "Sale" sign up and days when the retailer decided to put the blue "Sale" sign up. Red: 2.1, 3.6, 3.5, 2.5, 2, 3, 2.6, 2.6, 2, 3, 2.7 Blue: 2.6, 4.5, 4.1, 5, 4.6, 2.8, 3.9, 4.8 Assume that both populations follow a normal distribution. What can be concluded at the a = 0.10 level of significance level of significance? For this study, we should use Select an answer a. The null and alternative hypotheses would be: Но Select an answer V (please enter a decimal) Ho: Select an answer V Select an answer V H (Please enter a decimal) Select an answer Y Select an aNSwer V Select an answer b. The test statistic ?v = (please show your answer to 3 decimal places.) с. The p-valuе (Please show your answer to 4 decimal places.) d. The p-value is ?V a e. Based on this, we…