How often do users of a certain social media post on the​ site? The accompanying table represents the frequency of posting for a sample of 961 respondents classified according to their age groups. At the 0.05 level of​ significance, is there evidence of a relationship between the frequency of posting and age​ group? Calculate the test statistic.

The correlation between midterm and final grades for 300 students is 0.620. If 5 points are added to each midterm grade, the new r will be: a. 0.124 b. 0.57 c. 0.62 d. 0.744

Find the mean, the median, and the mode(s), if any, for the given data. Round noninteger means to the nearest tenth. (If there is more than one mode, enter your answer as a comma-separated list. If an answer does not exist, enter DNE.) 39, 30, 6, 25, 9, 21, 28, 10 mean      median

Find the mean, the median, and the mode(s), if any, for the given data. Round noninteger means to the nearest tenth. (If there is more than one mode, enter your answer as a comma-separated list. If an answer does not exist, enter DNE.) 27, 31, 20, 46, 36, 6, 55, 11 mean      median      mode(s)

Determine whether the given value is a statistic or parameter. A sample of Canada geese who mate is observed and the average (mean) number of offspring is 3.8     Statistic     Parameter

find the mean, median, and range of the set of numbers. Then, use Excel to create a frequency table and a histogram of the test scores. Make sure to label your tables and graphs appropriately A researcher is studying reaction times in mice. The reaction times in milliseconds (ms) for thirty mice are shown below.   66 384 539 578 166 741 874 384 221 178 176 675 275 15 845 397 271 655 681 702 63   823 364 194 755 744 557 776 69 857

A sample of the lifetime of an electrical component is given bellow, in number of hours: 123, 116, 122, 110, 210, 126, 125, 111, 118, 117 Calculate the sample mean and sample median for these lifetimes. Sample Mean 127.8 Sample Median 120 Can you explain why these two measures of location are so different? Submit Question

Find the mean, the median and the mode of the given data set. (Round your answers to four decimal places. If there is more than one mode, enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) S = {45, 45, 60, 70, 75, 75, 85} mean     median     mode

I vacuum cleaners. The weights are classified according to vacuum cleaner type. At a=0.10, can you conclude that at least one mean vacuum cleaner weight is different The table available below shows the weights (in pounds) for a sample from the others? E Click the icon to view the vacuum cleaner weight data. Let Hgu. PBLU and PTC represent the mean weights for bagged upright, bagless upright, and top canister vacuums respectively. What are the hypotheses for this test? O A. Ho: Heu * PBLU HTC H PBU PBLU =HTC Weight of Vacuum Cleaners by Type O B. Ho: At least one of the means is different. H PBu = HBLUu =PTC &c. Họ: PBU = HBLU =HTC Bagged upright 22 19 Bagless upright Top canister 21 22 23 25 H: At least one of the means different. 17 20 15 18 18 19 O D. Ho: PBU = PBLU "HTC 23 20 26 25 22| 23 Ha: Peu * PBLU *HTC What is the test statistic? Print Done F= (Round to two decimal places as needed.)

In a student survey, fifty-two part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below: Please round your answer to 4 decimal places for the Relative Frequency if possible. # of Courses Frequency Relative Frequency Cumulative Frequency 1 0.3462 18 2 19 37 3 15 0.2885 What percent of students take exactly two courses?