A math class is given a difficult test and they score poorly on the test. The...
- A math class is given a difficult test and they score poorly on the test. The instructor asks each individual student approximately how many minutes they studied for the test to see if there is some correlation between how long they studied and their test score. Here is the data for seven students:
|
Student |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
|
Minutes studied |
60 |
85 |
78 |
90 |
93 |
45 |
51 |
|
Test score |
78 |
42 |
68 |
53 |
62 |
50 |
76 |
Use a Spearman rank correlation test to determine if there is significant correlation between these two variables.
- State the null and alternative hypotheses.
- Compute the sample test statistic.
- Find the p-value.
- State the conclusion at the .05 level of significance.
Homework Answers
Add Answer to:
A math class is given a difficult test and they score poorly on
the test. The...
On the first day of class, an economics professor administers a test to gauge the math preparedne...
On the first day of class, an economics professor administers a test to gauge the math preparedness of her students. She believes that the performance on this math test and the number of hours studied per week on the course are the primary factors that predict a student's score on the final exam. She collects data from 60 students, a portion of which is shown in the accompanying table Final 94 74 Math 92 90 Hours 63 64 icture Click...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding each answer to the nearest whole number. Using the frequency distribution below (scores on a statistics exam taken by 80 students), determine:ion 1 of the preliminary test (scores on a statistics exam taken by 80 students), determine: 68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 93 71 59 85 75 61 65 75 87 74 62 95...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding each answer to the nearest whole number. Using the frequency distribution below (scores on a statistics exam taken by 80 students), determine:ion 1 of the preliminary test (scores on a statistics exam taken by 80 students), determine: 68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 93 71 59 85 75 61 65 75 87 74 62 95...
Having done poorly on their Math finals in June, eight students repeat the course in summer...
Having done poorly on their Math finals in June, eight students repeat the course in summer school and take another exam in August, June 54 49 68 66 58 60 62 62 August 50 65 74 64 56 65 68 72 If we consider these students to be representative of all students who might attend this summer school in other years, do these results provide evidence that the program is worthwhile? (a) Set up the appropriate Ho and H (b)...
Student Test Score Student Test Score Student Test Score 1 30 13 26 25 9 2...
Student Test Score Student Test Score Student Test Score 1 30 13 26 25 9 2 29 14 43 26 36 3 33 15 43 27 61 4 62 16 68 28 79 5 59 17 63 29 57 6 63 18 42 30 46 7 80 19 51 31 70 8 32 20 45 32 31 9 60 21 22 33 68 10 76 22 30 34 62 11 13 23 40 35 56 12 41 24 26 36...
A magazine tested paints. The table below shows the overall quality score and cost in dollars...
A magazine tested paints. The table below shows the overall quality score and cost in dollars per gallon. Use the rank correlation coefficient to test for a correlation between the two variables. Use a significance level of α=0.01. Based on these results, do you get better quality paint by paying more? Determine the null and alternative hypotheses for this test. Determine the correlation coefficient. Quality 82 85 63 76 85 80 62 79 74 72 68 Cost 21 20...
A principal of a middle school wants to investigate whether student performance on a math test...
A principal of a middle school wants to investigate whether student performance on a math test depends on instructor of the class. She selects 18 random students and assigns each of them randomly to one of three different instructors. The test scores are given below. Is there sufficient evidence to conclude that student performance differs between instructors? Use significance level 0.1 Note that the numbers in this problem have been manufactured such that all of the group means and the...
A principal of a middle school wants to investigate whether student performance on a math test...
A principal of a middle school wants to investigate whether student performance on a math test depends on instructor of the class. She selects 18 random students and assigns each of them randomly to one of three different instructors. The test scores are given below. Is there sufficient evidence to conclude that student performance differs between instructors? Use significance level 0.1 Note that the numbers in this problem have been manufactured such that all of the group means and the...
Select your answer. We use the data below and the Wilcoxon test to determine whether the...
Select your answer. We use the data below and the Wilcoxon test to determine whether the true median score on a certain test is significantly different from 67. 91 42 39 62 55 82 67 44 51 77 61 52 76 85 80 71 55 67 61 93 49 78 57 88 79 81 63 51 75 The sum signed rank statistic (as defined in the textbook) is O none of the answers provided here 0 -12 148 O-46 O...
Problem 8.4: Refer to Muscle Mass Problem 1.27. Second-order regression model (8.2) with independent normal error...
Problem 8.4: Refer to Muscle Mass Problem 1.27. Second-order regression model (8.2) with independent normal error terms is expected to be appropriate. A. Fit regression model (8.2). Plot the fitted regression function and the data. Does the quadratic regression function appear to be a good fit here? Find R^2. B. Test whether or not there is regression relation; use α= .05. State the alternatives, decision rule and conclusion. C. Estimate the mean muscle mass for women aged 48...
On the first day of class, an economics professor administers a test to gauge the math preparedness of her students. She believes that the performance on this math test and the number of hours studied per week on the course are the primary factors that predict a student's score on the final exam. She collects data from 60 students, a portion of which is shown in the accompanying table Final 94 74 Math 92 90 Hours 63 64 icture Click...
Having done poorly on their Math finals in June, eight students repeat the course in summer school and take another exam in August, June 54 49 68 66 58 60 62 62 August 50 65 74 64 56 65 68 72 If we consider these students to be representative of all students who might attend this summer school in other years, do these results provide evidence that the program is worthwhile? (a) Set up the appropriate Ho and H (b)...
Select your answer. We use the data below and the Wilcoxon test to determine whether the true median score on a certain test is significantly different from 67. 91 42 39 62 55 82 67 44 51 77 61 52 76 85 80 71 55 67 61 93 49 78 57 88 79 81 63 51 75 The sum signed rank statistic (as defined in the textbook) is O none of the answers provided here 0 -12 148 O-46 O...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago