Hi i need some help with some extra practice problems. please let me know if you have any questions. This is for my own personal learning this is not a homework assignment, or exams so please stop blocking my question i would like some help.

Question 8 1 pts A distribution has a standard deviation of a - 14. Find the z-score for a score above the mean by 28 points. 02 0 -2 05 0 -5 Question 9 1 pts For a population with u = 100 and o = 16, find the score (X-value) that corresponds to z - .50 0 92 O 108 O 132 O 116 MacBook Airpurses/39698/quizzes/122025/take Question 10 1 pts Which of the following z-scores is more "extreme" (further from the mean)? 03 O 25 0 15 0 45 Question 11 1 pts True or false: As the alpha level Increases, the size of the critical region increases and the risk of a Type I error increases. O True O False Question 12 1 pts If a researcher rejects the null hypothesis, which type of decision error could the researcher have W X MacBook Airitory Bookmarks Profiles Tab Window Help courses/ 39698/quizzes/123025/take D Question 21 1 pts A negative value for a correlation indicates: O decrease in X tend to be accompanied by Increases in Y. O decreases in X tend to be accompanied by decreases in Y O a much weaker relationship than if the correlation were positive O comelations can never be negative O a much stronger relationship than if the correlation were positive D Question 22 1 pts A distribution of test scores is approximately normal with a mean of u = 500 and a standard deviation of a = 100. What is the minimum score needed to be in the highest 10%% of the population? 0 371 0 558 0 700 MacBook Air %D Question 23 1 pts For a normal distribution with u = 100 and o = 4, what proportion of scores in the "population" have values between 96 and 104? 0.16 D Question 24 1 pts For the same normal distribution with u = 100 and o = 4, what proportion of "samples" of size n = 4 will have means with values between 96 and 104? 0 57 0.$5 0.97 MacBook Air E R YDI Question 25 1 pts A Cognitive Science researcher is interested in whether there are changes in brain activity in the prefrontal cortex, measured in blood oxygenation (Y), as people perform more and more challenging statistics problems (X]. The sum of products for X and Y (SP[XY]) Is 750, and the sum of squares for X is 25, What is the slope of the line of best fit between Problem Difficulty and Blood Oxygenation Level? 05 0 30 0 136 0 .05 D Question 26 1 pts The same researcher also finds that the mean Problem Difficulty Is 4, and the mean Blood Oxygenation Level is 400. What is the intercept for the line of best fit between Problem Difficulty and Blood Oxygenation Level? MacBook Au E R T Y U O PD Question 38 1 pts Do we have evidence for an effect of treatment for two-tailed test the .05 level? Yes, reject the null No, fail to reject the null D Question 39 1 pts Scenario: Does the age at which babies learn to crawl depend on the time of the year that the babies were born? Data were collected from parents who brought their babies into the University of Denver's Infant Study Center to participate in one of a number of experiments between 1988 and 1991. Parents reported the birth month and the age in which their child first began to crawl. The resulting data were grouped by month of birth: January, May, and September. Birth Month Mean Std. Dev. January 29.84 7.08 32 May 28.58 8.07 27 9 Pu TO MacBook Air 20 F3 BB6 FA FS -F6 44 F7 F8 E9 F10 5 8 E R T Y U P D G KX + courses/39698/quizzes/122025/take Question 45 0 pts For a = .05, what is the critical value for the study above? 0 5.99 0 7.81 O 2.92 O 4.3 D Question 46 0 pts Compute the appropriate test statistic for the problem in the previous ques tion. What is your obtained test statistic? x2 = 12.78 O t = 3.29 x2 =20.62 O.t= 2.56 19 MacBook Air 20 Fa 868 F4 44 F5 F6 F7 FO F10 4 5 R Y U O P D G H K