The data below show a sample of grades of students on their final exam in a statistics class. Grades 81 84 83 69 80 70 74 67 71 64 63 68 79 a) Find the average final exam grades for this class. [Round your answer to two decimal places.] The mean of midterm exam for the class was 83.31. Did the students tend to perform better on their final exam or midterm exam? Select an answer Final Exam Midterm Exam  b) Find the sample standard deviation of the final exam grades. [Round your answer to two decimal places.] The standard deviation of the midterm grades was 5.31. Did the student's final grades tend to have more or less variation than their midterm grades? Select an answer more variation less variation

The scores and the percents of the final grade for a student in a stats class are given. What is the student's mean score? Complete the thirds column

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The top 16 winning scores for NFL games are listed below. Find the mean score.   Video Tutorial: How to find the mean on a TI-84   72 54 52 54 70 51 56 58 58 52 51 63 51 48 52 61     A. 54   B. 57.1   C. 63.2   D. 56.4

Researchers wondered whether the size of a person's brain was related to the individual's mental capacity. They selected a sample of 5 females and 5 males and measured their MRI image pixel counts and IQ scores. Females Males MRI IQ MRI IG The data is reported to the right. Complete parts (a) through (d) below 139 858,472 140 955,003 935,494 924,059 1.079.550 1,001.121 Click the icon to view the critical values table. 991,305 138 141 857,782 833,868 790,619 133 135 132 141 135 140 AMRI 1,080,000- AIO 145 AIO 145- AMRI 1,080,000 780,000 130 130 780,000 130 780,000 780,000 130 1,080,000 145 1,080,000 MRI 145 MRI (b) Compute the linear correlation coefficient between MRI count and IQ. Are MRI count and IQ linearly related? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. (Round to three decimal places as needed.) A. Yes, MRI count and IQ are linearly related since the linear correlation coefficient is O B. No. MRI count and IQ are not…

The table below shows the scores of a group of students on a 10-point quiz. Test Score Frequency 3 1 4 1 7 4 8 4 9. 10 2 The mean score on this test is: The median score on this test is: Check Answer

A pediatrician wants to determine the relation that may exist between a child's height and head circumference. She randomly selects 8 children from her practice, measures their height and head circumference and obtains the data shown below.  Height          Head Circumference  27                        17.5 25                        17 26.5                     17.2 25.5                      17 27.75                    17.4 26.25                   17.4  26                         17.1 27.25                    17.4   data table n 3    0.997 4    0.950 5    0.878 6    0.811 7     0.754 8     0.707 9     0.666 10   0.632 11    0.602 12   0.576 13   0.553 14   0.532 15   0.514 16   0.497 17   0.482 18   0.468 19   0.456 20   0.444 21    0.433 22    0.423 23    0.413 24    0.404 25    0.396 26    0.388 27    0.381 28    0.374 29    0.367 30    0.361   compute the linear correlation coefficient between the height and head circumference of a child. r = ____ (round to three decimal places as…

Next question The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range, mean, variance, and sta the sample data set. 12, 16, 23, 14, 17, 18, 21, 18, 15, 15 9 ...... The range is: (Simplify your answer.)

The data below represents the number of T-shirts sold per week by a student who started his own online T-shirt business. Find the mean number of T-shirts sold per week. (Round your answer to the nearest tenth if necessary.) T-Shirts Sold per Week Frequency 4 3 8 2 12 4 16 6

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