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1. If one wants to test whether there is a difference in mean scores before and...
If one wants to test whether there is a difference in mean scores before and after...
If one wants to test whether there is a difference in mean scores before and after an exam, which will be an appropriate test to use? a) one sample z test b) one sample t test c) paired t test d) two sample independent t test If X is a random variable following a Uniform(a,b) distribution, which option represents an approxi- mate shape of its density function? a) straight vertical line between a and b b) straight horizontal line between...
Multiple Choice Questions Choose the one alternative that best completes the statement or answers the question...
Multiple Choice Questions Choose the one alternative that best completes the statement or answers the question (2.5 points each). You do not need to justify your answers. A If one wants to test whether there is a difference in mean scores before and after an exam, which will be an appropriate test to use? a) one sample z test b) one sample t test c) paired t test d) two sample independent t test B If X is a random...
21) A researcher wants to know whether there is a difference in the physical activity level of children during the morni...
21) A researcher wants to know whether there is a difference in the physical activity level of children during the morning and afternoon. He observes a total of 40 children (20 boys and 20 girls) from randomly selected schools during morning and afternoon recess and gives each child a score (out of 50) based on how much of the time they spend sitting, standing, walking or running. Each child receives a score in the morning and another in the afternoon....
QUESTION 52-Conceptual Set 1. A researcher wants to study exercise as a way of reducing anger...
QUESTION 52-Conceptual Set 1. A researcher wants to study exercise as a way of reducing anger expression. He plans to throw water balloons at participants, measure their anger using behavioral cues (e.g., number of swear words, redness of face, etc.), make them do 20 pushups, then measure their anger again. He wants to see if there are differences before and after 20 pushups. Which t-test should he use? QUESTION 53-Conceptual Set 1. Why should he (the researcher from question 52)...
A medical researcher wants to determine whether a drug changes the body’s temperature. Seven test subjects...
A medical researcher wants to determine whether a drug changes the body’s temperature. Seven test subjects are randomly selected, and the body temperature (in degrees Fahrenheit) of each is measured. The subjects are then given the drug and after 20 minutes, the body temperature of each is measured again. The results are listed below. Use significance level α = 0.05, and we assume that the body temperatures are normally distributed. Show your work space provided below: t-Test: Paired Two Sample...
Suppose you want to determine whether there is a significant difference in mean test scores for...
Suppose you want to determine whether there is a significant difference in mean test scores for females and males. The test is out of 600 points. Using the following hypotheses: Ho: U1 - U2 = 0 HA: U1 - U2 (not equal) 0 And alpha of 0.05 you obtain the following results t-test Two-sample assuming unequal variances Females Males Mean 525 487 Variance 3530.8 2677.818182 Observations 16 12 Hypothesized Mean Difference 0 df 25 t stat 1.803753 P (T<=t) one...
siness test before and after the course. The results are given below. Student Exam Score Before...
siness test before and after the course. The results are given below. Student Exam Score Before the Course Exam Score After the Course 1 630 770 2 690 770 3 910 1,000 4 750 710 5 450 550 6 840 860 7 820 770 8 630 610 9 580 585 (a) Use an appropriate hypothesis test, at 0.01 level of significance, to determine whether there is evidence of a difference between before and after scores of the students. (b) What...
The owner of an Italian restaurant has redesigned the menu and wants to see if the amount custome...
The owner of an Italian restaurant has redesigned the menu and wants to see if the amount customers spend (on average) will be greater with the new menu. He records the sales the week before the change and the sales the week after the change. Using the sample means and standard deviations for the two weeks, which statistical inference should he perform? A. a t test for paired samples (using differences) B. the owner should compute the mean dining bill...
1- Choose the functions that should be used to test whether your dataset meets the assumptions...
1- Choose the functions that should be used to test whether your dataset meets the assumptions for a two-sample t-test. Select one or more: a. mean() b. normalTest() c. qt() d. var.test() e. var() 2- Which of the following is the name of a mandatory argument to the function read.csv in R? Select one: a. file b. sep c. header d. quote 3- Match the type of comparison to its appropriate null hypothesis. The sample mean is not different from...
-If Argyle says that she has collected data that only tell her whether the cases are...
-If Argyle says that she has collected data that only tell her whether the cases are the same or different, one can accurately say that she has collected data on the _____ level. nominal ratio ordinal interval -which of these is an advantage of using a transformed score when reporting the score of an individual case? Transformed scores will be reported on the nominal level. Transformed scores will allow the mean score to be reported. Transformed scores provide a measure...
Multiple Choice Questions Choose the one alternative that best completes the statement or answers the question (2.5 points each). You do not need to justify your answers. A If one wants to test whether there is a difference in mean scores before and after an exam, which will be an appropriate test to use? a) one sample z test b) one sample t test c) paired t test d) two sample independent t test B If X is a random...
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