Suppose the scores on a recent exam in your statistics class were as follows: 78, 96,...

Suppose the scores on a recent exam in your statistics class were as follows: 78, 96, 60, 93, 55, 84, 76, 92, 62, 83, 80, 90, 64, 75, 79, 31, 75, 64, 99, 74, 88, 61, 82, 68, 79, 78, 80, 85. a) Create a stemplot for these test scores using each 10s value once on the stem and ordered leaves on each branch.

Refer to the test scores in the Question above
a) Create a histogram for the test scores. b) Explain how you decided how many intervals to use for the histogram in part (a). c) Comment on the shape of the histogram in part (a).

Expert Solution

orchestra answered 1 year ago

Suppose the scores on a recent paper in your statistics class were as follows: 66, 66,...

Suppose the scores on a recent paper in your statistics class were as follows: 66, 66, 86, 75, 57, 70, 77, 73, 76, 96, 87, 60, 98, 76, 83, 94, 88, 59, 90, 77, 76, 31, 58, 75, 92, 80, 82, 80 (a) Create a five-number summary. Lowest Value: Lowest quartile: Median: Highest quartile: Highest value:

The final exam scores in a statistics class were normally distributed with a mean of 70...

The final exam scores in a statistics class were normally distributed with a mean of 70 and a standard deviation of five. What is the probability that a student scored less than 55% on the exam?

Exam grades: Scores on a statistics final in a large class were normally distributed with a...

Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 70 and a standard deviation of 10. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals. (a) Find the 42nd percentile of the scores. (b) Find the 71st percentile of the scores. (c) The instructor wants to give an A to the students whose scores were in the top 10% of the class. What...

A) Suppose that the mean and standard deviation of the scores on a statistics exam are...

A) Suppose that the mean and standard deviation of the scores on a statistics exam are 89.2 and 6.49, respectively, and are approximately normally distributed. Calculate the proportion of scores below 77. 1) 0.0301 2) 0.9699 3) We do not have enough information to calculate the value. 4) 0.2146 5) 0.7854 B) When students use the bus from their dorms, they have an average commute time of 8.974 minutes with standard deviation 3.1959 minutes. Approximately 66.9% of students reported a...

The following are final exam scores for 30 students in an elementary statistics class.

The following are final exam scores for 30 students in an elementary statistics class. 91 59 82 91 79 76 90 69 77 83 59 88 95 72 88 81 77 52 80 96 62 97 76 75 75 89 61 72 90 85 a. Find the quartiles for this data______________________________. b. What is the Interquartile Range (IQR)_________________________? c. What percent of students got at least a 72 on their final exam______________? d. Build a boxplot using the graphing calculator.

A sample of 10 students record their scores on the final exam for their statistics class....

A sample of 10 students record their scores on the final exam for their statistics class. The mean of the sample is 81 with sample standard deviation 7 points. Analysis of the 10 sample values indicated that the population is approximately normal. We wish to find the 95% confidence interval for the population mean test scores. 1. What is the confidence level, c? 2. Which of the following is correct? a. To find the confidence interval, a z-critical value should...

You were told that the mean score on a statistics exam is 75 with the scores...

You were told that the mean score on a statistics exam is 75 with the scores normally distributed. In addition, you know the probability of a score between 55 and 60 is 4.41% and that the probability of a score greater than 90 is 6.68%. What is the probability of a score between 55 and 95?

Suppose a professor gives an exam to a class of 40 students and the scores are...

Suppose a professor gives an exam to a class of 40 students and the scores are as follows. (Type the data set in StatCrunch.) 35 44 46 47 47 48 49 51 53 54 55 55 57 57 57 58 59 59 59 59 60 60 60 60 60 62 62 62 64 68 69 70 72 73 73 75 75 77 82 88 Top 10% of scores receive an A Bottom 10% of scores receive an F Scores between...

PART I Suppose that the mean and standard deviation of the scores on a statistics exam...

PART I Suppose that the mean and standard deviation of the scores on a statistics exam are 78 and 6.11, respectively, and are approximately normally distributed. Calculate the proportion of scores above 74. 1) 0.8080 2) 0.1920 3) 0.2563 4) We do not have enough information to calculate the value. 5) 0.7437 PART II When students use the bus from their dorms, they have an average commute time of 9.969 minutes with standard deviation 3.9103 minutes. Approximately 27.23% of students...

Exam 2 scores of the class are given below 80, 52, 69, 78, 34, 67, 99,...

Exam 2 scores of the class are given below 80, 52, 69, 78, 34, 67, 99, 76, 67, 56, 68, 78, 77, 79 What’s the mean? What’s the median? What’s the mode? What’s the variance? What’s the standard deviation? What’s the range? If Jake took a makeup exam and got a 84.8 from this exam, what is his z score? (use the mean and the standard deviation calculated in part a and e). What does this z score tell us...

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