A sales analyst wants to determine whether there is a difference in the mean monthly sales of a company'sfour sales regions. Several salespersons from each region are randomly selected and they provide theirsales amount (in thousands of dollars) for the previous month. Using a 5% significance, can we conclude atleast one region is different on average?Region SalesNorthNorthNorthNorthEastEastEastEastEastSouthSouthSouthSouthWestWestWestWestWest21363328283531353912227272330273139What is the factor variable? [Select an answerWhat is the response variable? [Select an answerTest Statistic:P-Value:Decision Rule: Select an answerDid Something Significant Happen? Select an answerThere Select an answer to conclude Select an answer

Given: The data for the sales amount of several regions for the previous month is provided.…

Answered: A sales analyst wants to determine…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The Economist collects data each year on the price of a Big Mac in various countries around the world. The price of a Big Mac for a sample of McDonalds restaurants in Europe in May 2009 resulted in the following Big Mac prices (after conversion to U.S. dollars): 3.80 5.89 4.92 3.88 2.65 5.57 6.39 3.24 The mean price of a Big Mac in the U.S. in May 2009 was $3.57. For purposes of this exercise, assume it is reasonable to regard the sample as representative of European McDonalds restaurants. Does the sample provide convincing evidence that the mean May 2009 price of a Big Mac in Europe is greater than the reported U.S. price? Test the relevant hypotheses using α = .05. Assume a normal distribution of the data.x¯x¯=; ss=H0H0: μ=μ=HaHa: μμ (Put in the correct symbol and value)α=α=P-value =
The Economist collects data each year on the price of a Big Mac in various countries around the world. The price of a Big Mac for a sample of McDonalds restaurants in Europe in May 2009 resulted in the following Big Mac prices (after conversion to U.S. dollars):3.80 5.89 4.92 3.88 2.65 5.57 6.39 3.24The mean price of a Big Mac in the U.S. in May 2009 was $3.57. For purposes of this exercise, assume it is reasonable to regard the sample as representative of European McDonalds restaurants. Does the sample provide convincing evidence that the mean May 2009 price of a Big Mac in Europe is greater than the reported U.S. price? Test the relevant hypotheses using a = .05. Assume a normal distribution of the data. x = Ho: μ = Ha: Select an answer α= P-value = |: S= Based on the above we choose Question Help: Post to foru Submit Question (Put in the correct symbol and value) ✓ Select an answer Reject the null hypothesis Fail to reject the null hypothesis
Employee Salary (K$) CEO 299 CTO 250 CIO 250 CFO 290 Manager 77 Manager 123 Manager 84 Manager 63 Manager 68 Manager 49 Manager 82 Manager 87 Supervisor 42 Supervisor 37 Supervisor 29 Supervisor 43 Supervisor 51 Supervisor 38 Supervisor 33 Supervisor 42 Supervisor 49 Worker 25 Worker 19 Worker 41 Worker 17 Worker 26 Worker 25 Worker 21 Worker 28 Worker 27 Look at the data and answer the questions. -what percentage of the employees make more than the mean salary? -what percentage of the employees make more than the median salary? -what percentage of the employees make more than the mode salary? -in his radio show A Prairie Home Companion host Garrison Keillor regularly tells his audience about Lake Wobegon, where "all the children are above average". Is that possible, with any of the meanings of "average"?
Students in a statistics class wrote as many letters of the alphabet as they could in 15 seconds using their nondominant hand. The figure for this exercise is a boxplot that compares the number of Metters written by males and females in the sample. Males Females 5 7 13 15 19 21 23 (a) What is the median number of letters written by females? letters (b) What is the median for males? letters (c) Explain whether the interquartile range is larger for males or for females. The IQR is larger for -Select- (d) Find the value of the range for males. | letters (e) Find the value of the range for females. letters Submit Answer W 19 ... MacBook Air O00 A00 F4 F7 FB F9 F10 FIV F12 FI F2 F3 F5 F6 @ 2# $ % &
U.S. companies lose billion 63.2 per year from workers with insomnia. According to 2013 a article in The Wall Street Journal, workers lose an average of 7.8 days of productivity per year due to lack of sleep. The following data show the number of hours of sleep attained during a recent night for a sample of 20 workers. 7 5 10 7 7 8 8 5 9 6 7 7 9 6 8 8 9 5 10 7 a. What is the mean number of hours of sleep for this sample (to decimals)? b. What is the variance? Standard deviation (to decimals)? Variance Standard deviation
The Economist collects data each year on the price of a Big Mac in various countries around the world. The price of a Big Mac for a sample of McDonalds restaurants in Europe in May 2009 resulted in the following Big Mac prices (after conversion to U.S. dollars): 3.80 5.89 4.92 3.88 2.65 5.57 6.39 3.24The mean price of a Big Mac in the U.S. in May 2009 was $3.57. For purposes of this exercise, assume it is reasonable to regard the sample as representative of European McDonalds restaurants. Does the sample provide convincing evidence that the mean May 2009 price of a Big Mac in Europe is greater than the reported U.S. price? Test the relevant hypotheses using a = .05. Assume a normal distribution of the data. x = S= Ho: μ = Ha: Select an answer (Put in the correct symbol and value) α= P-value: = Based on the above we choose t✓ Select an answer Question Help: Post to forur Reject the null hypothesis B
Secretary of State Roxana Tillerson is worried about malpractice at the 4 processing centers for Green Cards in the country. Green Card applications are given a grade g on a scale 0-100. They are assigned randomly to different centers and thus Tillerson expects all centers to have similar mean scores. She collects the data in the table. #applications 9360 67.27 15.29 1 9870 66.74 14.64 7020 66.94 15.14 3 5040 67.02 14.84 4 rows x 3 columns At this point she just wants to decide whether or not to initiate a deeper investigation into malpractice at all sites. Does she have sufficient evidence for this, at 6% significance? SSTT number (rtol=0.01, atol=0.0001) SSE number (rtol=0.01, atol=0.0001) F. number (rtol=0.01, atol=0.0001) P-val number (rtol=0.01, atol=0.0001) O (a) No, she cannot make a conclusion O (b) Yes, she has enough evidence Select the key assumptions in the test you used. O (a) The populations are independent and therefore their covariances are zero. O (b) All sample sizes…
Make a graphical display of the following data sets, choosing nay type of display that you feel is appropriate. Explain your choice of display and discuss any interesting features in the data. The following table shows the perscentages of American men and women who had never been married in selected years since 1960. Percentages of Adults Who Never Married Year Women Men 1960 19.0% 25.3% 1980 22.5% 29.6% 2000 21.5% 31.3% 2015 28.9% 34.8%
A consumer magazine wants to compare lifetimes of ballpoint pens of three different types. The magazine takes a random sample of pens of each time and records the lifetimes (in minutes) in the table below. Do the data indicate that there is a difference in the mean lifetime for the three brands of ballpoint pens? Brand 1 Brand 2 Brand 3 260 181 238 218 240 257 184 162 241 219 218 213
The data in the accompanying table gives the food segment (burger, chicken, pizza, or sandwich) and average sales per unit ($ thousands) for each of 28 quick-service brands. Complete (a) through (d) below. Click here to view the data table. a. At the 0.05 level of significance, is there evidence of a difference in the mean U.S. average sales per unit ($ thousands) among the food segments? Determine the hypotheses. Choose the correct answer below. O B. Ho: H1 = H2 = • • • = H28 O A. Ho: H1 = H2 = • • • = H4 H;: Not all H; are equal (where j= 1,2,.,4) H,: Not all H; are equal (where j= 1,2,.,28) O D. Ho: 41 = H2 = • •• = H28 O C. Ho: H1 = H2 = • •• = H4 H;: H1 H2 # ••• † H4 b. Find the test statistic. FSTAT = (Round to two decimal places as needed.) c. Determine the critical value, F = (Round to two decimal places as needed.) d. Reach a decision. V Hg. There is V evidence of a difference in the mean U.S. average sales per unit among the food segments.
2. For fast-food restaurants, the drive-through window is an important revenue source. The fast-food chain that offers the fastest service is likely to attract additional customers. Each year QSR Magazine publishes its results of a survey of drive-through service times at fast-food chains. In a recent year, the mean time was 226.07 seconds for Wendy’s, 236.50 seconds for Taco Bell, 193.31 seconds for Burger King, 273.29 seconds for McDonald’s, and 218.85 seconds for Chick-fil-A. Suppose the study was based on 20 customers for each fast-food chain. The ANOVA table for this problem is presented below. a. Interpret the result of the Analysis of Variance (ANOVA). What is the statistical decision and corresponding conclusion? b. What is the implication of the results obtained from the analysis of the data?
A grocery store manager wants to estimate the mean purchase total for all customers that shop at her store. To do so, she selects a random sample of 30 receipts from the large list of all receipts that are stored in the computer. Here is a dotplot of the results. The mean purchase total is $93.80 and the median purchase total is $75.80. The store manager investigates and learns that the customer that made a $500 purchase had not purchased groceries, but rather a $500 gift card. Because this customer’s purchase was not typical, the manager decides to exclude this total from the data set. How will removing the $500 purchase from the data set affect the value of the mean and the median? (A) The mean will decrease more than the median. (B) The mean will decrease less than the median. (C) The mean will stay the same, but the median will decrease. (D) The mean will increase more than the median. (E) The mean will increase, but not as much as the median.

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