10/23/2016 Quiz: Ch. 9 Assignment: Hypothesis testing, z test, conf. interval, type I and II.f16 Ch. 9 Assignment: Hypothesis testing, z test, conf. interval, type I and II.f16 Started: Oct 18 at 3:03pm Quiz Instructions Your as s ignm ent is due and available beginning Monday. The lates t you can s ubm it the as s ignm ent is 11:59pm on Sunday night. Pleas e s ubm it prior to clos ing. Question 1 0.5 pts The Central Lim it Theorem (CLT) s tates that the s am pling dis tribution of the m ean will approach the norm al curve as s am ple s ize gets larger of the m ean will approach the norm al curve as the num ber of s am ples increas es of the m ean will approach the norm al curve only if the population is norm ally dis tributed of any s tatis tic will approach the norm al curve as the num ber of s am ples increas es . Question 2 1 pts Data Set 73 From a random s am ple of 36 college s tudents the following s tatis tics were obtained on the Milligram "Could You Be a Nazi?" s hock tes t. The higher the s core on this tes t the m ore the pers on obeys authority: = 300 volts , = 60 volts . The 99 percent confidence interval about the m ean in Data Set 73 is 135 to 465 272.50 to 327.50 295.42 to 304.58 none of the other alternatives are correct. Question 3 2 pts For ques tion #2 above, pleas e write your res ults of the confidence interval tes t. HTML Editor p https://csn.instructure.com/courses/1279162/quizzes/1772585/take Font Sizes Paragraph 1/6 10/23/2016 Quiz: Ch. 9 Assignment: Hypothesis testing, z test, conf. interval, type I and II.f16 Question 4 1 pts Data Set 74 A random s am ple of 64 s tudents produced the following s tatis tics : = 18.00, = 7.00. The 95 percent confidence interval about the m ean in Data Set 74 is 16.25 to 19.75 17.78 to 18.22 4 to 32 none of the other alternatives are correct. Question 5 2 pts Pleas e write the Englis h the res ults of the confidence interval tes t in ques tion #3 HTML Editor Font Sizes Paragraph p Question 6 1 pts Inferential s tatis tics are us ed to decide whether s am ple data accurately repres ent a particular relations hip in the population. get rid of s am pling error. im prove s am pling error. decide whether the population caus es a particular relations hip in the s am ple data. Question 7 1 pts When is a onetailed tes t us ed? When no relations hip is predicted When a relations hip is predicted and the direction in which the s cores will change is predicted When the dem ons trated relations hip is predicted https://csn.instructure.com/courses/1279162/quizzes/1772585/take 2/6 10/23/2016 Quiz: Ch. 9 Assignment: Hypothesis testing, z test, conf. interval, type I and II.f16 When a relations hip is predicted without s tating the direction in which the s cores will change Question 8 1 pts Which of the following null hypothes es would require us ing a twotailed tes t? Question 9 1 pts When can the z tes t be us ed in s tatis tical hypothes is tes ting? When the m eas ure of central tendency us ed for the raw s cores is the m edian When the raw s cores are trans form ed from a nom inal s cale to a ratio s cale When the raw s core population's s tandard deviation is known When the z tes t s tandard deviation is known Question 10 0.5 pts For a twotailed tes t where p = 0.05, is always equal to 1.96. +1.96. 1.96. 1.645. Question 11 If 1 pts and what is the value of ? 2.58 0.52 -2.58 https://csn.instructure.com/courses/1279162/quizzes/1772585/take 3/6 10/23/2016 Quiz: Ch. 9 Assignment: Hypothesis testing, z test, conf. interval, type I and II.f16 0.78 Question 12 1 pts When s tatis ticians report that the res ults from an experim ent are significant, this m eans the res ults are s cientifically im portant. are too unlikely to accept as s am pling error. differ from what was predicted by the experim ental hypothes es . do not differ from what was predicted by the null hypothes is . Question 13 1 pts For and Fail to reject , what is the appropriate outcom e of a z tes t? . Reject and accept . Reject and accept . Fail to reject . Question 14 1 pts Suppos e that a population is known to have a m ean of 80. If a res earcher predicts the experim ental treatm ent will produce an increas e in the population m ean, then the null hypothes is for this s tatis tical hypothes is tes t would s tate > 80 <80 >80 < 80 Question 15 1 pts The Phys ical Fitnes s Tes t (National Level for Girls ) s hows the national average for 10yearold girls on \"rightangle pus hups \" to be = 13. Principal Sm yth hypothes izes that her girls at Strong School are s ignificantly above the national m ean. If the here, com pute 14 16 and determ ine if Principal Sm yth is right. Us e 18 16 12 16 https://csn.instructure.com/courses/1279162/quizzes/1772585/take 17 and the s cores for nine girls are as reported . 20 15 4/6 10/23/2016 Quiz: Ch. 9 Assignment: Hypothesis testing, z test, conf. interval, type I and II.f16 , s o Principal Sm yth is right. , s o Principal Sm yth is wrong. , s o Principal Sm yth is right. , s o Principal Sm yth is wrong. Question 16 1 pts Which of the following tes ts is cons idered to be m ore powerful? A onetailed tes t A twotailed tes t Neither they are both equally s tatis tically powerful Which is m ore powerful depends on the s am ple s ize Question 17 1 pts Jeri has conducted a s tudy on the average s alary of recent graduates in her m ajor at State College. She has random ly s elected and s urveyed 25 recent graduates from her program . The annual average incom e of this s am ple of recent graduates is $34,000. Jeri knows that the population m ean incom e for recent graduates in her area of s tudy is $31,000 with a Reject and accept If s he us es . Reject and accept . Reject and accept . Reject and a twotailed tes t, what is her conclus ion? and accept . Question 18 0.5 pts When choos ing between onetailed and twotailed tes ts , us e a onetailed tes t only if you have a convincing reas on for predicting the direction. always us e twotailed tes ts . us e a twotailed tes t only if you have a convincing reas on for not predicting a direction. us e the one that is m os t likely to produce s ignificant res ults . Question 19 https://csn.instructure.com/courses/1279162/quizzes/1772585/take 0.5 pts 5/6 10/23/2016 Quiz: Ch. 9 Assignment: Hypothesis testing, z test, conf. interval, type I and II.f16 Which of the following is the probability of avoiding a Type I error? p = a p = (1 a) p < a p > a Question 20 0.5 pts Which of the following accurately defines a Type II error? Rejecting when it is true Rejecting when it is fals e Failing to reject when it is true Failing to reject when it is fals e Question 21 0.5 pts The null hypothes is and its norm al dis tribution, the m ean of the s am pling dis tribution of m eans is always greater than the population m ean. les s than the population m ean. equal to the population m ean. the population m ean divided by the s quare root of N. Quiz s aved at 2:05am https://csn.instructure.com/courses/1279162/quizzes/1772585/take Subm it Quiz 6/6