In a study of store checkout scanners, 1234 items were checked for pricing accuracy, and 20 checked items were found to be overcharges. Use a 0.05 significance level to test the claim that when scanners are used, the number of items that are overcharged is equal to 1%. Use both Critical Value and P-Value Methods. State the claim: State the claim in symbols Null and Alternative hypotheses: What type tail test? Test Statistic: Critical Value Method P-Value Method Critical Value Graph: P-Value Graph: Critical Value(s): P-Value: Decision: Decision: Final Conclusion:

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For a continuous variable you always draw a line graph. True False

Explain conditions for use of the t-procedures?

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Is the number of people in their household for members of this class a discrete or continuous variable?

Several states have argued that the 65-mph speed limit has no justification and have refused to enforce it. The federal Department of Transportation (DOT) believes that the 65-mph limit saves lives. To illustrate its contention, the department regressed the number of traffic fatalities (Y) last year in a state on the state’s population (X1), the number of days of snow cover (X2), and the average speed of all cars (X3). The results are shown below. Table 10: Model Summary Model R R Square Adjusted R Square Std. Error of the Estimate 1 .821 a .780 .613 3.258 a. Predictors: (Constant), population, days of snow, average speed   Table 11: Coefficients Coefficientsa Model Unstandardized Coefficients Standardized Coefficients t Sig. B Std. Error Beta 1 (Constant) 1.4 2.957   .473 .584 Population .00029 .00003 .0034 9.667 .000 Days of Snow 2.4 .62 .759 3.871 .000 Average Speed 10.3 1.1…