Independent random samples taken on two university campuses revealed the following information concerning the average amount of money spent on textbooks during the fall semester. The population standard deviations are also shown below.     University A University B Sample Size 50 40 Average Purchase $260 $270 Standard Deviation (σ) $23 $20   We want to determine if, on the average, students at University A spent less on textbooks than the students at University B. What is the test statistic? (Round to the 3 decimal places; otherwise, no credit.)

Use the magnitudes​ (Richter scale) of the 120 earthquakes listed in the accompanying data table. Use technology to find the​ range, variance, and standard deviation. If another​ value, 8.00, is added to those listed in the data​ set, do the measures of variation change much? 3.272.452.542.432.752.372.192.421.911.432.851.731.992.322.332.704.742.873.382.722.833.423.952.993.873.473.082.942.703.602.842.373.033.232.593.643.242.662.352.432.813.952.522.922.983.412.272.562.933.162.201.151.934.002.542.832.352.311.522.801.951.602.452.332.081.553.201.491.812.551.662.352.452.082.192.752.002.792.392.671.692.881.841.991.862.561.972.183.671.553.162.461.881.502.793.283.822.752.452.712.541.642.183.032.361.481.922.322.651.411.391.802.242.302.481.732.402.442.482.44

When investigating times required for drive-through service, the following results (in seconds) were obtained. Restaurant A 120 123 153 128 124 118 154 110 Restaurant B 115 126 147 156 118 110 145 137 Find the range and standard deviation for each of the two samples, then compare the two sets of results. Round to the nearest tenth.

Listed below are prices in dollars for one night at different hotels in a certain region. Find the​ range, variance, and standard deviation for the given sample data. Include appropriate units in the results. How useful are the measures of variation for someone searching for a​ room?   138 257 127 137 198 117 211 164         Question content area bottom Part 1 The range of the sample data is 140140 dollars.dollars.   ​(Round to one decimal place as​ needed.) Part 2 The standard deviation of the sample data is enter your response here dollars.dollars.   ​(Round to one decimal place as​ needed.)

Listed below are the amounts (dollars) it costs for marriage proposal packages at different baseball stadiums. Find the range, variance, and standard deviation for the given sample data. Include appropriate units in the results. Are there any outliers, and are they likely to have much of an effect on the measures of variation? 35 45 45 65 70 80 80 150 195 203 250 375 500 2000 2500 The range of the sample data is 2465 dollars. (Type an integer or a decimal. Do not round.) The standard deviation of the sample data is (Round to one decimal place as needed.).

A developmental psychologist is interested in studying how long babies gaze at a photograph of a human face. To test this question, she shows a picture to a sample of six babies and records the length of their gaze in seconds. The data are as follows: 12, 17, 18, 20, 20, 29. Calculate the mean, median, mode, range, variance and standard deviation for the sample.

Listed below are the amounts (dollars) it costs for marriage proposal packages at different baseball stadiums. Find the range, variance, and standard deviation for the given sample data. Include appropriate units in the results. Are there any outliers, and are they likely to have much of an effect on the measures of variation? 38 50 50 65 70 75 85 140 185 216 265 350 400 1500 3000 The range of the sample data is 2962 dollars. (Type an integer or a decimal. Do not round.) The standard deviation of the sample data is 798.4 dollars. (Round to one decimal place as needed.) The variance of the sample data is 637463.1 dollars. (Round to one decimal place as needed.) Are there any outliers and, if so, are they likely to have much of an effect on the measures of variation? OA. No, there are not any outliers. B. Yes, the smallest amounts are much lower than the rest of the data, and appear to be outliers. It is not likely that these are having a large effect on the measures of variation. OC.…

Furnace repair bills are normally distributed with a mean of 271 dollars and a standard deviation of 20 dollars. If 64 of these repair bills are randomly selected, find the probability that they have a mean cost between 271 dollars and 273 dollars. Round to four decimal places. A. 0.2881 OB. 0.2119 O C. 0.5517 O D. 0.7881

The following is a sample of scores. What is the standard deviation? X 4 2 6 4 3 2 7 5 2 3

Listed below are the top 10 annual salaries​ (in millions of​ dollars) of TV personalities. Find the​ range, variance, and standard deviation for the sample data. Given that these are the top 10​ salaries, do we know anything about the variation of salaries of TV personalities in​ general?   41      40      38      31      23      21      19      18      17.8      17.2