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Study Resources (Statistics)

  61) The table below shows the number of cars sold last month by six employees at Concord Motors and their number of years of sales experience.                               A) 0.456 B) 0.519 C) 0.667 D) 0.712 62) The table below shows the number of cars sold last month by six employees at Concord Motors and their number.
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  71) Costco sells paperback books in their retail stores and wanted to examine the relationship between price and demand. The price of a particular novel was adjusted each week and the weekly sales were recorded in the table below.   Sales Price 7 $12 4 $11 5 $10 9 $9 8 $8 8 $7 7 $7   The correlation coefficient for this data is ________. A) -0.361 B) -0.523 C) -0.706 D) 0.140 Answer: .
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  21) The correlation coefficient measures the percentage of the total variation of the dependent variable that is explained by the independent variable from a sample. 22) A coefficient of determination equal to zero indicates that there is no relationship between the independent and dependent variables. 23) The hypothesis test for the population.
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  31) If the confidence interval for the regression slope includes zero, we would have some evidence that β could be equal to zero, which would indicate that there may not be a relationship between the dependent and independent variables. 32) An assumption of regression analysis is that the relationship between the.
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  81) The sum of squares regression for this regression model is ________. A) 60.23 B) 267.61 C) 327.84 D) 410.25 82) The number of employees that were included in the sample is ________. A) 19 B) 20 C) 24 D) 25 83) The multiple coefficient of determination for this model is ________. A) 0.6644 B) 0.7796 C) 0.8163 D) 0.9035 84) The degrees of freedom.
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  41) The Department of Transportation would like to investigate if a difference exists in the proportion of flights that arrive on-time between Alaska Airlines, Delta Airlines, Southwest Airlines, and United Airlines. The following data represent the number of on-time flights from random samples taken from each airline.     Alaska Delta Southwest United Number On-time 90 95 85 60 Sample Size 100 120 100 80   The chi-square.
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  129) Use the Marseille Water Taxi data to calculate the total sum of squares, sum of squares error, and sum of squares regression. 130) Use the Marseille Water Taxi data to: A)Calculate the coefficient of determination. B)Interpret the meaning of the coefficient of determination. C)Test the significance of the coefficient of determination using α.
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  101) The 95% confidence interval for the regression coefficient for the Exp variable is ________. A) (-0.461, 0.939) B) (-0.022, 0.501) C) (0.039, 0.439) D) (0.139, 0.339) 102) Which one of the following statements is true concerning the 95% confidence interval for the regression coefficient for the Exp variable? A) Because the confidence interval includes zero,.
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  104) The Department of Housing and Urban Development (HUD) would like to test the hypothesis that there is a difference in the standard deviation for the size of newly constructed houses in 2010 when compared to newly constructed houses in 2000. The following data summarizes the sample statistics for house.
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  94) Edmunds.com would like to test the hypothesis that the standard deviation for the age of an imported car on the road is greater than the standard deviation for the age of a domestic car. The following data shows the ages of a random sample of import and domestic cars.   Import 1 3 4 5 4 5 10 Domestic 4 5 4 6 5 4 6 A).
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  117) Determine the correlation coefficient for this data and interpret its meaning. 118) Use the NFL team data to perform a hypothesis test to determine if the population correlation coefficient is less than zero using α = 0.05. 119) Use the NFL team data to: A)Describe the regression line that will predict number.
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  103) Expedia would like to test the hypothesis that the standard deviation for the roundtrip airfare between Philadelphia and Paris is higher for a flight originating in Philadelphia when compared to a flight originating in Paris. The following data summarizes the sample statistics for roundtrip flights originating in both cities..
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  91) The p-value for the hypothesis test for the overall regression model is ________. A) 0.3265 B) 0.0709 C) 0.0396 D) 4.0112E-07 92) Which one of the following statements describes the results of the hypothesis test for the overall regression model using α = 0.05? A) Because the p-value is greater than alpha, we reject the.
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  81) Costco sells paperback books in their retail stores and wanted to examine the relationship between price and demand. The price of a particular novel was adjusted each week and the weekly sales were recorded in the table below.   Sales Price 7 $12 4 $11 5 $10 9 $9 8 $8 8 $7 7 $7   Management would like to use simple regression analysis to estimate weekly demand.
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  51) Suppose Apple would like to test the hypothesis that the standard deviation for the web browsing battery life of the iPad equals 3.0 hours. The following data represents the battery life, in hours, experienced by a random sample of six users.               A) 5.11 B) 5.67 C) 6.32 D) 6.81 52) Suppose Apple would like.
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  107) State University offers several sections of a Business Statistics course in an in-class and online format. Both formats are administered the same final exam each year. You have been assigned to test the hypothesis that the standard deviation for the final exam score of in-class students is different from.
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  51) An assumption of regression analysis is homoscedasticity, which states that the A) variation of the dependent variable is the same across all values for the independent variable. B) residuals exhibit no patterns across values for the independent variable. C) residuals exhibit no patterns across values for the dependent variable. D) relationship between.
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  134) Use the Marseille Water Taxi data to determine the 95% confidence interval for the slope and interpret the results.                                       135) Use the Home Plus data to determine the correlation coefficient for this data and interpret its meaning. 136) Use the Home Plus data to perform a hypothesis test to determine if.
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  1) In a multiple regression model, a dependent variable explains the variation in the independent variables. 2) Excel requires that the independent variables be located in adjacent columns in the spreadsheet. 3) Using the multiple regression equation to predict the dependent variable using values of independent variables outside of the range of.
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  1) A dependent variable, x, explains the variation in another variable, which is called the independent 2) Consider the relationship between the following variables: 3) Consider the relationship between the following variables: 4) A scatter plot is a useful tool to examine the data before conducting correlation analysis. 5) A relationship is linear.
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  81) A retail chain would like to test if a difference exists between the variability of customer satisfaction scores from two locations. The following data represents satisfaction scores from a random sample of customers from these locations on a scale of 1-20.   Location 1 12 14 20 18 15 17 16 Location 2 18 19 17 18 16 20     The correct hypothesis statement would be A) H0:.
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  61) The following distribution shows the frequency distribution of the number of shots a particular NBA player blocked in one game for a random sample of 100 games.   Blocked Shots per Game Frequency 0 4 1 20 2 31 3 21 4 15 5 or more 9   You have been assigned the task to test if the distribution of blocked shots per game for this.
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  61) Sony would like to test the hypothesis that the standard deviation for the age of PlayStation users is higher than the standard deviation for the age of Xbox users. The following table summarizes sample statistics from each population.     PlayStation Xbox Sample standard deviation 4.3 years 3.9 years Sample size 25 28   Using α = 0.05, the conclusion.
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  51) The airline industry defines no-shows as passengers who have purchased a ticket but fail to arrive at the gate on time for departure. United Airlines operates many flights from Philadelphia to Dallas and experienced the following no-show probability distribution last year.   No-shows 0 1 2 3 4 5 Probability 5% 15% 20% 30% 20% 10%   The following data represent the number of no-shows that.
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  137) Use the Home Plus data to: A)Describe the regression line that will predict monthly sales based on the monthly advertising. B)Interpret the slope of the regression equation. C)Predict the average number of sales for a month with $2 million spent on advertising. A) B)Each additional $1 spent on advertising per month will increase.
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  1) There is no statistical technique for directly testing a hypothesis about a population standard deviation. 2) The test statistic that is used to test the variance of a single population follows the normal probability distribution. 3) The hypothesis test for a single population variance requires that the sample size is greater.
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  120) Use the NFL team data to calculate the total sum of squares, sum of squares error, and sum of squares regression. 121) Use the NFL team data to: A)Calculate the coefficient of determination. B)Interpret the meaning of the coefficient of determination. C)Test the significance of the coefficient of determination using α = 0.05. A)R2.
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