A study is done to compare the average value of settlements negotiated by two competing law firms on behalf of individuals who were victims in automobile accidents. 15 cases were randomly selected from each firm. Firm A cases had an average settlement of $27,565 with a standard deviation of $10,880. Firm B cases had an average settlement of $22,322 with a standard deviation of $6,674. Use this information to answer the following questions and test the claim that the average settlement of Firm A is no more than the average settlement of Firm B. Use alpha=0.10.The left critical value = [left] (round to 2 decimals – if there is no left value, enter “na”)The right critical value = [right] (round to 2 decimals – if there is no right value, enter “na”)The test statistic = [ts] (round to 2 decimals)The result of the hypothesis test is [result] (enter “reject H0” or “fail to reject H0”)Is the claim supported? [support] (enter “yes” or “no”)

Market researchers studying the demographics of soda drinkers claim that the average age of Coke drinkers is the same as that of Mountain Dew drinkers.To test their claim, the researchers randomly select 300 Coke drinkers and 300 Mountain Dew drinkers. The average age of the Coke drinkers is 31.7 with a standard deviation of 14.34 years, and the average age of Mountain Dew drinkers is 29.7 with a standard deviation of 12.76 years.Based on this data, and using an alpha=0.01, answer the following questions and test the claim.The left critical value = [left] (round to 2 decimals – if there is no left value, enter “na”)The right critical value = [right] (round to 2 decimals – if there is no right value, enter “na”)The test statistic = [ts] (round to 2 decimals)The result of the hypothesis test is [result] (enter “reject H0” or “fail to reject H0”)Is the claim supported? [support] (enter “yes” or “no”)

Given the following descriptions determine H0 (the Null Hypothesis), H1 (the Alternative Hypothesis), and specify which is the Claim. A.  A researcher claims that more than 55% of voters are against gun control.    H0:  p [1c1] 55% (enter correct sign(s))   H1:  p [1c2] 55% (enter correct sign(s))   The claim is [m1] (enter “H0” or “H1”) B.  In a study of college students, a researcher claims that the average time a student spends studying in a statistics class is 3.5 hours per week.    H0:  mu [2c1] 3.5 (enter correct sign(s))   H1:  mu [2c2] 3.5 (enter correct sign(s))   The claim is [m2] (enter “H0” or “H1”) C.  Data was collected regarding income levels in Utah. A state senator claims that the standard deviation of annual income in Utah is at least $25,000.    H0:  sigma [3c1] $25,000 (enter correct sign(s))   H1:  sigma [3c2] $25,000 (enter correct sign(s))   The claim is [m3] (enter “H0” or “H1”) D.  You’re thinking that fewer than 5% of those infected with Covid-19 need medical assistance, and want to make that claim.    H0:  p [4c1] 5% (enter correct sign(s))   H1:  p [4c2] 5% (enter correct sign(s))   The claim is [m4] (enter “H0” or “H1”)  

The table below shows data from a study comparing what people said their annual income was (in thousands of dollars), as opposed to what they reported on their tax return. Assuming alpha=0.02, use this data to test the claim that people say they have a greater annual income than what they actually report on their taxes. Said 140 123 100 84 75 71 for Tax 139 118 99 84 72 70 What is the mean of the difference in incomes (d-bar)? [dbar] (round to 1 decimal)What is the standard deviation of the difference (s-d)? [sd] (round to 2 decimals)What is the left critical value? [cvL] (round to 2 decimals – enter “na” if there is none)What is the right critical value? [cvR] (round to 2 decimals – enter “na” if there is none)What is the value of the test statistic? [ts] (round to 2 decimals)What is the result of the hypothesis test? [result] (enter “reject H0” or “fail to reject H0”)Is the claim supported? [support] (enter “yes” or “no”)

A study is done to compare the average value of settlements negotiated by two competing law firms on behalf of individuals who were victims in automobile accidents. 15 cases were randomly selected from each firm. Firm A cases had an average settlement of $26,220 with a standard deviation of $11,245. Firm B cases had an average settlement of $27,430 with a standard deviation of $12,340. Use this information to answer the following questions and test the claim that the average settlement of Firm A is at least as much as the average settlement of Firm B. Use alpha=0.05.The left critical value = [left] (round to 2 decimals – if there is no left value, enter “na”)The right critical value = [right] (round to 2 decimals – if there is no right value, enter “na”)The test statistic = [ts] (round to 2 decimals)The result of the hypothesis test is [result] (enter “reject H0” or “fail to reject H0”)Is the claim supported? [support] (enter “yes” or “no”)

A claim is made that the proportion of kids who play sports is more than 33%. A sample of n=300 subjects is randomly selected, and data shows 39% play a sport. Assume an alpha of 0.03, and answer the following questions:H0: p [c1] 33% (enter correct sign(s))H1: p [c2] 33% (enter correct sign(s))The claim is [m1] (enter H0 or H1)The critical value on the left, if there is one = [cv1] (round to 3 decimals-if none, enter “na”)The critical value on the right, if there is one = [cv2] (round to 3 decimals-if none, enter “na”)The test statistic = [ts] (round to 3 decimals)The result of the hypothesis test of H0 is [result] (enter “reject H0” or “fail to reject H0”)Is the claim supported? [support] (enter yes or no)

A weight loss product claims that, after a week of using their product, a person’s weight will go down by more 5 pounds. To test this claim, 5 people are randomly selected who use the weight loss product for a week. Before and after weights are  shown in the table below. Use this data to answer the following questions and to test the claim. Assume alpha=0.01. Before 155 189 142 245 288 After 150 183 137 239 282 What is the mean of the difference in weight (d-bar)? [dbar] (round to 1 decimal)What is the standard deviation of the difference in weight (s-d)? [sd] (round to 2 decimals)What is the left critical value? [cvL] (round to 2 decimals – enter “na” if there is none)What is the right critical value? [cvR] (round to 2 decimals – enter “na” if there is none)What is the value of the test statistic? [ts] (round to 2 decimals)What is the result of the hypothesis test? [result] (enter “reject H0” or “fail to reject H0”)Is the claim supported? [support] (enter “yes” or “no”)

Using the data shown in the table below, answer the following questions.What is the correlation between X1 and Y? [corX1Y] (round to 2 decimals)What is the correlation betwen X2 and Y? [corX2Y] (round to 2 decimals)What is the correlation betwen X1 and X2? [corX1X2] (round to 2 decimals)How much of the variation in Y is explained by a regression model that uses only X1 to predict Y? [r2X1] (round to 2 decimals)How much of the variation in Y is explained by a regression model that uses only X2 to predict Y? [r2X2] (round to 2 decimals)How much of the variation in Y is explained by a regression model that uses both X1 and X2 to predict Y (hint: R-squared)? [r2X1X2] (round to 2 decimals)How much of the variation in Y is explained by a regression model that uses both X1 and X2 to predict Y, taking into account the correlation between X1 and X2 (hint: Adjusted R-squared)? [adjr2X1X2] (round to 2 decimals)At what level is the multiple regression statistically significant (i.e.,Sig.F)? [sig] (round to 2 decimals)In the multiple regression model, what is the coefficient of X1 in the regression equation? [X1cof] (round to 2 decimals)In the multiple regression model, what is the coefficient of X2 in the regression equation? [X2cof] (round to 2 decimals)What is the intercept in multiple regression equation? [int] (round to 2 decimals)Given X1=95.5 and X2=105.5, what would be the predicted value of Y? [esty] (round to just 1 decimal) Y X1 X2 98.6 87.4 108.5 101.2 97.6 110.1 102.4 96.7 110.4 100.9 98.2 104.3 102.3 99.8 107.2 101.5 100.5 105.8 101.6 103.2 107.8 101.6 107.8 103.4 99.8 96.6 102.7 100.3 88.9 104.1 97.6 75.1 99.2 97.2 76.9 99.7 97.3 84.6 102.0 96.0 90.6 94.3 99.2 103.1 97.7 100.3 105.1 101.1 100.3 96.4 102.3 104.1 104.4 104.4 105.3 110.7 108.5 107.6 127.1 111.3

Which of these is true in this course? A.  I need a code to access all the quizzes B. I need a code to access some quizzes C. I need no code to access any of the quizzes D. All of the above

A weight loss product claims that, after a week of using their product, a person’s weight will go down by more 4 pounds. To test this claim, 5 people are randomly selected who use the weight loss product for a week. Before and after weights are  shown in the table below. Use this data to answer the following questions and to test the claim. Assume alpha=0.05. Before 155 189 142 245 288 After 150 183 137 239 282 What is the mean of the difference in weight (d-bar)? [dbar] (round to 1 decimal)What is the standard deviation of the difference in weight (s-d)? [sd] (round to 2 decimals)What is the left critical value? [cvL] (round to 2 decimals – enter “na” if there is none)What is the right critical value? [cvR] (round to 2 decimals – enter “na” if there is none)What is the value of the test statistic? [ts] (round to 2 decimals)What is the result of the hypothesis test? [result] (enter “reject H0” or “fail to reject H0”)Is the claim supported? [support] (enter “yes” or “no”)