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On a math test, the scores of 24 students were

98, 71, 75, 65, 75, 75, 98, 82, 75, 66, 83, 71, 71, 83, 75, 71, 83, 75, 71, 82, 71, 83, 82, 65.

Construct a frequency distribution. Use 4 classes beginning with the lower class limit of 60.

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Sumant
SumantLv10
26 Feb 2021
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Related textbook solutions

Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

Related questions

Costco Customer Satisfaction. Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of is expected. In 2012, Costco, with its 432 warehouses in 40 states, was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Cosco customer satisfaction scores follows.

95   90   83   75   95   98   80   83   82   93   86   80   94   64   62

a. What is the sample mean customer satisfaction score for Costco?

b. What is the sample variance?

c. What is the sample standard deviation?

Construct a hypothesis test to determine whether the population standard deviation of should be rejected for Costco. With a.05 level of significance, what is your conclusion?

 

1. 

What type of information does a histogram show?

A. Frequency

B. Categorical

C. Data jumps

D. Specific data points

E. Random

 

2. If a student got a 75, which bar should increase?

A. 0 -60

B. 61-70

C. 71 - 80

D. 81 - 90

E. 91 - 100

 

3. The histogram shows test scores. Based on the information, how many students got a score 91 per cent or better?

A. 1

B. 0

C. 2

D. 6

E. 5

 

 

A reading comprehension test out of 90 points is given to a Grade 5 class of 30 students. Their scores are randomly listed below. 77 43 60 28 59 60 63 59 45 79 38 51 79 54 62 71 51 43 63 59 54 54 60 56 51 71 34 62 28 62 Part 1. (21 points) a. Prepare a frequency distribution table of the raw scores* grouped according to frequency (f). Also show the cf and the c% columns. For c% report up to 2 decimal places. Don’t round up. (*Hint: show only the scores in the data set.) (10 pts) b. Draw a bar graph of this f-distribution table. Be sure to label the axes. (4 pts) c. Make a stem and leaf display of the scores. Be sure to label the two columns of the display and arrange the leaves in ascending order. (4 pts) d. Find the percentile rank of X = 50. Use the f-distribution table with scores grouped according to class intervals, i = 5, in Part 2a below. (Hint: use the formula in the course Study Guide.) (3 pts) Part 2. (21 points) a. Prepare a f-distribution table with the scores grouped according to class intervals, i = 5. Show the f, cf, and c% columns. For c% report up to 2 decimal places. Don’t round up. (10 pts) b. Draw a histogram of this f-distribution table. (4 pts) c. Draw a polygon of this f-distribution table. (4 pts) d. Find the 20th percentile in this f-distribution table. (Hint: use the formula in the Course Study Guide.) (3 pts)

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