The frequency distribution shows the results of 200 test scores. Are the test scores normally distributed? Use α=0.01.
Class boundaries |
49.5-58.5 |
58.5-67.5 |
67.5-76.5 |
76.5-85.5 |
85.5-94.5 |
|
---|---|---|---|---|---|---|
Frequency, f |
202 |
61 |
79 |
35 |
5 |
Using a chi-square goodness-of-fit test, you can decide, with some degree of certainty, whether a variable is normally distributed. In all chi-square tests for normality, the null and alternative hypotheses are as follows.
H0: The test scores have a normal distribution.
Ha: The test scores do not have a normal distribution.
a) Find the expected frequencies.
b) find the critical value a
c) find the chi-square test statistic
The frequency distribution shows the results of 200 test scores. Are the test scores normally distributed?...
The frequency distribution shows the results of 200 test scores. Are the test scores normally distributed? PART B. Determine the critical value and the rejected region PART C. Calculate the test statistic PART D. Decide whether to reject or fail to reject the null hypothesis The frequency distribution shows the results of 200 test scores. Are the test scores normally distributed? Use α= 0.01. Complete parts (a) through (d) Class boundaries Frequency, f 49.5-58.5 20 58.5-67.5 62 67.5-76.5 79 76.5-85.5...
The frequency distribution shows the results of 200 test scores. Are the test scores normally distributed? Use a =0.01. Complete parts (a) through (e). Class boundaries 49.5-58.5 58.5-67.5 Frequency, f 19 62 D 67.5-76.5 81 76.5-85.5 33 85.5-94.5 5 Using a chi-square goodness-of-fit test, you can decide, with some degree of certainty, whether a variable is normally distributed. In all chi-square tests for normality, the null and alternative hypotheses are as follows. Ho: The test scores have a normal distribution....
The frequency distribution shows the results of 200 test scores Are the test scores nomally distributed? Use α-0.10 Complete parts is) through (e) Class boundaries Frequency, 49.5-585 2D 58.5-67.5 51 67.5-76.5 B0 76.5-85.5 35 95.5-94.5 Using a chi-square goodness-of-fit test, you can decide, with some degree of certainty whether a variable is normally distributed. In all chi-square tests for nomality the null and alternative hypotheses are as follows Ho The test scores have a nomal distribution Ha The test scores...
Exercise 3. At a = 0.05, test the claim that the data in the frequency distribution below are normally distributed Class boundaries | 359.5-376.5 376.5-393.5 393.5-410.5 410.5-427.5 427.5-444.5 Frequency,f 5 61 216 70 Exercise 3. At a = 0.05, test the claim that the data in the frequency distribution below are normally distributed Class boundaries | 359.5-376.5 376.5-393.5 393.5-410.5 410.5-427.5 427.5-444.5 Frequency,f 5 61 216 70
The following frequency distribution represents the scores on a math test. Find the class midpoint of scores for the interval 40-59. Number of Scores Students 0-19 20-39 40-59 60-79 80-99 O A. 50.5 O B. 49,0 OC. 48.5 O D. 49.5
Scores by women on the SAT-1 test are normally distributed with a mean of 988 and a standard deviation of 202. Scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6. If a women gets a SAT score that is the 77th percentile, find her actual SAT score and her equivalent ACT score.
To determine if a set of ungrouped, raw data is normally distributed, the cumulative relative frequency distribution of the raw data is compared to a ____________. Select one: a. Grouped relative frequency distribution b. Cumulative normal distribution c. Anderson-Darling statistic d. Chi-square statistic
(Normal distribution: Finding a raw score) Suppose that scores on a particular test are normally distributed with a mean of 110 and a standard deviation of 19. What is the minimum score needed to be in the top 10% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place.
Use the following collection of 30 test scores: 100, 65, 67, 61, 62, 70, 75, 73, 88, 77, 83, 79,95, 79, 8102, 86, 87, 87, 91, 87, 89, 92, 90, 99, 87, 72, 93, 79, 52 a. Construct a frequency distribution table using 6 classes: include classes, frequencies, class marks, class boundaries, relative frequencies, and relative percentages. b. Find the mean to the nearest tenth and sample standard deviation to the nearest tenth. c. Use the results from part b...
Consider the observed frequency distribution for a set of grouped random variables available below. Perform a chi-square test using a alpha=0.05 to determine if the observed frequencies follow the normal probability distribution with mu=99 and sigma=20. Random Variable, x Frequency, f o Less than 79 9 79 to under 99 16 99 to under 119 18 119 and more 7 Total 50 Calculate the chi-square test statistic, χ2. χ2.=____ Determine the p-value_____ State the appropriate conclusion: Do not reject/Reject H...