Based on Tukey Multiple-Comparison Method, confidence interval for 4-4, 1S. 1. a) 11 b) 1. XS c) d)
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- The data referred to in this question were collected from several sales districts across the country. The data represent sales for a maker of asphalt roofing shingles. Information on the following variables is available: Sales Sales from last year in thousands of squares Expenditures Promotional expenditures in thousands of dollars Accounts Number of active accounts Competing Brands Number of competing brands producing equivalent or similar products District Potential A coded indicator of the potential of the district (higher score = better potential) Partial SPSS regression output of a multiple regression model with sales as the response variable and the other four variables as predictor variables is given below: ANOVA Sum of Model Squares df Mean Square F Sig. Regression 176777.1 4 44194.265 479.099 .000 Residual 1937.137 21 92.245 Total 178714.2 25 Coefficients Unstandardized Standardized Coefficients Coefficients Model Std. Error Beta t Sig. (Constant) Promotional Expenditures 1…Chapter 8 1) Construct a 95% confidence interval estimate for the population mean given that s =30 , x = 45 and n= 20. 2) A random sample of 81 workers at a company showed that they work an average of 100 hours per month with a standard deviation of 27 hours. At 95% confidence, how many more workers need to be included in the sample to provide a confidence interval with length 4 (i.e., the margin of error being 2)? Chapter 9 3) Given the following null and alternative hypothesis test: Họ : µ > 210 НА: и 200 against the alternative hypothesis HA : µ < contents in the 0.01 level of significance, test 200. Can we conclude that the company's claim is justified?5) There are two car dealers in town. The mean monthly sales at Smith Auto and Jones Cars are about the same. However, Kevin Smith, owner of Smith Auto, believes his sales are more consistent. a) State the Hypothesis to show the variation in the monthly sales is lower at Smith Auto than Jones Cars s. b) To test the hypothesis, you collect monthly sales data for the two companies. The data appears below. Use JMP to test the hypothesis of part a). c) Using alpha= 0.05, draw a conclusion for the hypothesis test and state the conclusion in the context of the problem. Dealership Sales Smith Auto 98 Smith Auto 78 Smith Auto 54 Smith Auto 57 Smith Auto 68 Smith Auto 64 Smith Auto 70 Jones Cars 75 Jones Cars 81 Jones Cars 81 Jones Cars 30 Jones Cars 82 Jones Cars 46 Jones Cars 58 Jones Cars 101
- You recently sent out a survey to determine if the percentage of adults who use social media has changed from 60%, which was the percentage of adults who used social media five years ago. Of the 2930 people who responded to survey, 1645 stated that they currently use social media. a) Use the data from this survey to construct a 94% confidence interval estimate of the proportion of adults who use soclal media. Record the result below in the form of (#, #). Round your final answer to four decimal places. b) Can you conclude that the percentage of adults who use social media has changed? Explain. O Yes, because the proportion of adults who used social media five years ago is inside of the confidence interval. O Yes, because the proportion of adults who used social media five years ago is not inside the confidence interval. O No, because the proportion of adults who used soclal media five years ago is Inside the confidence interval. O No, because the proportion of adults who used social…find d) length of confidence interval and graphLibrary Construct a 95% confidence interval to estimate the population mean with x = 110 and o = 28 for the following sample sizes. Accessit a)n = 33 b)n = 44 c)n = 66 Purchas Commu a) With 95% confidence, when n = 33, the population mean is between the lower limit of and the upper limit of (Round to two decimal places as needed.) Enter your answer in the edit fields and then click CheckK Answer. parts remaining Olear All Type here to search acer F2 F3 F4 F5 F6 F7 F8 Esc
- To run post hoc tests using the Tukey HSD, you must first find the Studentized Range statistic that corresponds to your alpha and df. a) True b) False8 and 95. a). What is a fundamental difference between the t statistic and a z-score in terms of variability? b). What value is estimated with a confidence interval using the t statistic?
- 17. Confidence interval is for population parameter and prediction interval is for a variable . Select one: True of falseYou recently sent out a survey to determine if the percentage of adults who use social media has: changed from SS%, which was the percentage of adults who used social media five years ago. Of the 2564 people who responded to survey, 1770 stated that they currently use social media. a) Use the data from this survey to construct a 98% confidence interval estimate of the proportioA of adults who use social media. Record the result below in the form of (#, #). Round your final answer to four decimal places. b) Can you conclude that the percentage of adults who use sdcial media has changed? Explain. O Yes, because the proportion of adults who used social media five years ago is inside of the confidence Interval. O Yes, because the proportion of adults who used soclal media five years ago İs not inside the confidence interval. O No, because the proportion of adults who used social media five years ago is inside the confidence interval. O No, because the proportion of adults who used social…