In conducting a goodness-of-fit test, a requirement is that
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In conducting a goodness-of-fit test, a requirement is that
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- The degrees of freedom for the t test for comparing two population means when the population variances are equal is:- Sample 1 A) 19. 19 B) 20 C) 21 D) 18.87 N₁-12 S1-3 Sample 2 N₂-10 S2-2A graduate student wants to train several research assistants to collect motor skill data on young children by rating the performance of a motor skill on a scale from 0-10. In order to establish __________ reliability, the graduate student would need to make sure that all of the research assistants gave the same rating over several performances of the skill. Criterion-related validity Test-retest reliability Inter-rater reliability Content validityIn a two sample (independent-sample) test, what must be true if t = 0? Group of answer choices A)The two population means must be equal. B)The two sample means must be equal. C)The two sample variances must be equal. D)The two population means must be not equal.
- The cross-tabulation data given below show the number of people who rated a customer service representative as friendly and polite based on whether the representative greeted them first. Complete parts a through d below. Friendliness/Politeness Staff Greeting No Yes No 13 4 Yes 16 20 ..... a. Write the hypotheses for the chi-square test for independence. Ho: Greeting and Customer Service Rating are independent H;: Greeting and Customer Service Rating are dependent b. Find the expected frequencies. Friendliness/Politeness Staff Greeting No No Yes Grand Total 9.30 7.70 17 Yes 36 16.30 24 (Type integers or decimals rounded to two decimal places as needed.) 19.70 Grand Total 29 53 c. Compute the chi-square statistic. (Type an integer or decimal rounded to two decimal places as needed.)Which of the statements is NOT true of F distributions? a) The F distribution is always positively skewed. b) Under a specific circumstance, the F distribution would be normal. c) The exact shape of the distribution is going to be determined by two degrees of freedom. d) There is only one F distribution for each pair of degrees of freedom.Donna claims that all chocolate candy colors (red, orange, blue, green, yellow, and dark brown) are equally likely to appear in a package. In order to test this, you collect a sample of size n= 55. Your sample contains 14 red, 6 orange, 10 blue, 5 green, 10 yellow, and 10 dark brown. If you were to perform a goodness of fit test, what would be the degrees of freedom?
- c) Compute the P-value c). 5. A die was rolled 90 times. The results were: OBserved # Frequency 20 22 10 8. 4. 13 17 Find the test- statistic that would be used to determine whether the die is a goodness of fit or is loaded.١١. In a Chi square goodness of fit test; the number of categories is 5, and the expected frequency is 25 students; thus the total number of students in the sample equals:Use SPSS for this Application Exercise: A health psychologist want to investigate whether there is a relationship between sex and food preference. The psychologist gave participants a questionnaire that asked which food the participants would choose to eat given the choice. What can be concluded with an a of 0.05? Food Sex spaghetti carrots donuts female 20 16 21 male 25 18 i. What is the appropriate test statistic? --Select- Compute the statistic selected in a): ii Obtain/compute the appropriate values to make a decision about Ho- p-value = Decision: -Select-- i Compute the corresponding effect size(s) and indicate magnitude(s). If not appropriate, input and/or select "na" below. Effect Size = ]: Magnitude: -Select-- iv I Make an interpretation based on the results. O There is a significant negative relationship between sex and food preference. O There is a significant food preference difference between sex. O Food preference and sex are independent.
- SLICE NAME Confidence Intervals and Hypothesis Testing TOPIC NAME Hypothesis test for the difference of population means: Z testIn a recent study of a random sample of 113 people, 92 reported dreaming in color. In the 1940’s, the proportion of people who reported dreaming in color was 29%. Is there evidence to show that the proportion of people who dream in color is different than the proportion in the 1940’s? What is the p-value for this hypothesis test? A) 6.04 x 10-35 B) 0.8142 C) 0.4071 D) 1.21 X 10-34 E) 12.279A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z = -1.95. Can we conclude that H0 should be rejected at the and level? Group of answer choices a) yes; b) yes; c) no a) no; b) no; c) yes a) yes; b) yes; c) yes a) no; b) no; c) no
