A case-control (or retrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers and whether they are injured or killed in a crash. Results are given in the accompanying table. Using a 0.01 significance level, test the claim that injuries are independent of helmet color. Black 489 201 White 377 Color of Helmet Yellow 28 Red 158 Blue 92 Controls (not injured) Cases (injured or killed) 117 8 67 45 Click here to view the chi-square distribution table. Compute the test statistic. (Round to three decimal places as needed.) Find the critical value(s). (Round to three decimal places as needed. Use a comma to separate answers as needed.) What is the conclusion based on the hypothesis test?

A case-control (or retrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers and whether they are injured or killed in a crash. Results are given in the accompanying table. Using a 0.01 significance level, test the claim that injuries are independent of helmet color. D Black Color of Helmet Yellow 32 Blue White 331 Controls (not injured) Red 159 482 100 Cases (injured or 211 109 8 65 47 killed) Click here to view the chi-square distribution table. Identify the null and alternative hypotheses. Choose the correct answer below. O A. Ho: Whether a crash occurs and helmet color are dependent H₁: Whether a crash occurs and helmet color are independent OB. Ho: Injuries and helmet color are dependent H₁: Injuries and helmet color are independent OC. Ho: Whether a crash occurs and helmet color are independent H₁: Whether a crash occurs and helmet color are dependent O D. Ho: Injuries and helmet color are independent H₁: Injuries…

12.

The accompanying table shows results of challenged referee calls in a major tennis tournament. Use a 0.05 significance level to test the claim that the gender of the tennis player is independent of whether a call is overturned. Was the Challenge to the Call​ Successful?       Yes No Men 246 790 Women 351 550

The table below shows the age and favorite type of music of 668 randomly selected people. Use a 0.05 significance level to test the claim that the favorite type of music is independent of age.                                      Rock Pop Classical                       15​ - 25      50 85 73                     25​ - 35      68 91 60                     35​ - 45       92         74 77 a. State Upper H 0 .     A. Favorite type of music is related to age   B. Favorite type of music is independent of age   C. More people age 35​ - 45 like rock than classical   D. The age groups are independent   b. Calculate the​ P-value. Which of these options is closest to the​ P-value?     A. 0.0065     B. 0.0094     C. 0.0083     D. 0.0074     c. State the technical conclusion.     A. Do not reject Upper H 0     B. Reject Upper H 0     d. State the final conclusion.     A. There is…

A​ case-control (or​ retrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers and whether they are injured or killed in a crash. Results are given in the accompanying table. Using a 0.01 significance​ level, test the claim that injuries are independent of helmet color.       Color of Helmet                   Black White   Yellow Red Blue     Controls​ (not injured)   494 343   27 168 99     Cases​ (injured or​ killed)   210 107    6 71 47

Does the type of instruction in a college statistics class (either lecture or self-paced) influence students’ performance, as measured by the number of quizzes successfully completed during the semester? Twelve students were recruited for the study. Students received the lecture instruction or a self-paced instruction. The total number of quizzes completed during teach type of instruction appear below.

Answer j and k

Is there an association between hair color and body type? The table below shows the results of a researcher's observations of randomly selected people. Frequencies of Hair Colors for Various Body Types Blonde Brunette Red Head 71 80 96 108 55 115 46 91 Short and Slender Short and Pudgy Tall and Slender Tall and Heavy What can be concluded at the o= 0.01 significance level? 53 74 69 63