MATH302 - Week 2 Knowledge Check Homework2

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American Military University *

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302

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Statistics

Date

Feb 20, 2024

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Uploaded by GrandSquid3781

Week 2 Knowledge Check Homework Practice Questions - Results Attempt 3 of 4 Written Jan 10, 2024 8:33 PM - Jan 10, 2024 10:24 PM Attempt Score 19 / 20 - 95 % Overall Grade (Highest Attempt) 19 / 20 - 95 % Question 1 1 / 1 point 11.90 Hide ques ! on 1 feedback Question 2 1 / 1 point An instructor wants to compare spread (variation) of final grades of students in her online class and face-to-face class. The instructor selects 10 students randomly from each class and the following table shows the final grades of those students. See Attached Excel for Data. final grade data.xlsx The standard deviation of final grades for the face-to-face class is Use the information to respond to the following question: (round to 2 decimal places) Use the Excel function to find the Sample SD use =STDEV.S function in Excel. The population FTES for 2005–2006 through 2010–2011 was given in an updated report. The data are reported here. See Attached Excel for Data. FTES data.xlsx Calculate the third quartile. Round to two decimal places. Use the Excel function to find the Quartile.

1922.75 Hide ques ! on 2 feedback Question 3 1 / 1 point Cholesterol levels were collected from patients two days after they had a heart attack (Ryan, Joiner & Ryan, Jr, 1985). Find the standard deviation. Use the Excel function to find the Sample SD. See Attached Excel for Data. cholesterol data.xlsx Hide ques ! on 3 feedback Question 4 1 / 1 point To determine if Reiki is an effective method for treating pain, a pilot study was carried out where a certified second-degree Reiki therapist provided treatment on volunteers. Pain was measured using a visual analogue scale (VAS) immediately before and after the Reiki treatment (Olson & Hanson, 1997). Higher numbers mean the patients had more pain. Use the box-and-whiskers plots of the before and after VAS ratings to determine if the Reiki method was effective in reducing pain. Choose the best response from the options below. Third Quartile: use =QUARTILE.INC( , 3) function in Excel. 45.76 47.71 2195 46.85 9.02 2276.29 use =STDEV.S function in Excel.

Question 5 1 / 1 point 205.5 (50 %) 272.5 (50 %) Hide ques ! on 5 feedback Question 6 1 / 1 point Which of the following is the graphical analog of a frequency table? No, since there were outliers for the after treatment measurements. Yes, the treatment was effective since all 3 quartiles for the after treatment measurements were smaller than the before treatment measurements. Yes, since there were outliers for the after treatment measurements. No, since there were more people in the before treatment measurements that had a higher pain scale. Enter your responses in the two blank spaces below. The box plot shows weights of all team members of a football team. The middle 50% of the weights for the box plot are from to . Round to 1 decimal place. Q3 = 272.5 and Q1 = 205.5

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Question 7 1 / 1 point Suppose that a histogram of a data set is approximately symmetric and bell shaped. Approximately what percent of the observations are within two standard deviations of the mean? Question 8 1 / 1 point The following data are the distances between 20 retail stores and a large distribution center. The distances are in miles. Which of the following is the mode? See Attached Excel for Data. distance miles data.xlsx Hide ques ! on 8 feedback Question 9 1 / 1 point Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? The histogram The time series plot The contingency table The scatterplot 99.7% 50% 95% 68% 96 89 84 34.5 86 The mode is the value that appears the most, which is 96.

Question 10 1 / 1 point Cholesterol levels were collected from patients two days after they had a heart attack (Ryan, Joiner & Ryan, Jr, 1985). Find the mode. See Attached Excel for Data. cholesterol data.xlsx Hide ques ! on 10 feedback Question 11 1 / 1 point The following data represents the percent change in tuition levels at public, four-year colleges (inflation adjusted) from 2008 to 2013 (Weissmann, 2013). Below is the histogram, what is the shape of the distribution? Only the mean and mode are equal Only the mean and median are equal The mean, median and mode are all equal Only the median and mode are equal 282 288 280 236 All of the above 236, 280, 282 and 288 all appear twice.

Question 12 0 / 1 point 241.28 (237.56) Skewed Right Skewed Left Symmetric Cannot be determined Cholesterol levels were collected from patients two days after they had a heart attack (Ryan, Joiner & Ryan, Jr , 1985). Use Excel to find the 38th percentile. Round to two decimal places. See Attached Excel for Data. cholesterol data.xlsx Use the Excel function =PERCENTILE.INC to find the Percentile. Retrieved from http://www.statsci.org/data/general/cholest.html . Fill in each of the values below: 38th percentile

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Hide ques ! on 12 feedback Question 13 1 / 1 point A sample of 8 cats found the following weights in kg. Use Excel to find the weight for the 75th percentile. See Attached Excel for Data. cat weight data.xlsx Hint: Use =PERCENTILE.INC function in Excel Hide ques ! on 13 feedback Question 14 1 / 1 point Use Excel Functions =PERCENTILE.INC( ,.38) 3.85 kg 3.6875 kg 3.7 kg 3.65 kg use =PERCENTILE.INC( , .75) in Excel. Cholesterol levels were collected from patients two days after they had a heart attack (Ryan, Joiner & Ryan, Jr , 1985). Use Excel to find the 50th percentile. Do not round. See Attached Excel for Data. cholesterol data.xlsx Use the Excel function =PERCENTILE.INC to find the Percentile Retrieved from http://www.statsci.org/data/general/cholest.html . Fill in each of the values below: 50th

268 Hide ques ! on 14 feedback Question 15 1 / 1 point The following data represents the percent change in tuition levels at public, four-year colleges (inflation adjusted) from 2008 to 2013 (Weissmann, 2013). Below is the frequency distribution and ogive. Class Limits Cumulative Frequency Use Excel Functions=PERCENTILE.INC( ,.50) or=MEDIAN The 50th percentile is also the median value.

2.2 – 11.7 6 11.8 – 21.3 26 21.4 – 30.9 37 31.0 – 40.5 41 40.6 – 50.1 43 50.2 – 59.7 45 59.8 – 69.3 48 69.4 – 78.9 50 Based on the information, how many colleges had a percent change in tuition below 50.2%? Hide ques ! on 15 feedback Question 16 1 / 1 point The following table summarizes the distribution of students by academic class. Academic Class Frequency 43 37 80 45 The Class Limit of 40.6 - 50.1 has a cumulative frequency value of 43. The next class limit starts at 50.2.

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Freshman 22 Sophomore 13 Junior 10 Senior 5 Select the correct bar graph for the distribution of students by academic class.

Question 17 1 / 1 point A survey by the Pew Research Center, conducted in 16 countries among 20,132 respondents from April 4 to May 29, 2016, before the United Kingdom's so-called Brexit referendum to exit the EU. The following is a time series graph for the proportion of survey respondents by country that responded that the current economic situation is their country was good. Which country had the least favorable outlook of their country's economic

situation in 2016? Graph source: http://www.pewglobal.org/2016/08/09/views-on-national-economies-mixed-as-many-countries- continue-to-struggle/ Hide ques ! on 17 feedback Question 18 1 / 1 point The Australian Institute of Criminology gathered data on the number of deaths (per 100,000 people) due to firearms during the period 1983 to 1997. The time-series plot is below. What year had the lowest rate of deaths? UK Italy Germany Poland France Greece Spain In 2016 Greece has the lowest peak

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Retrieved from http://www.statsci.org/data/oz/firearms.html . Hide ques ! on 18 feedback Question 19 1 / 1 point The graph below is for pulse rates before and after exercise. Were pulse rates higher on average before or after exercise? Before Pulse Rates After 9 8 8 7 6 5 2 6 9 8 8 8 6 5 5 5 1 1 0 0 7 8 8 7 5 4 2 8 5 6 6 7 8 9 4 0 9 0 1 1 2 3 4 5 5 6 8 4 10 0 1 4 6 7 11 6 7 1997 1989 1983 1985 1997 along the x-axis has the lowest peak along the y-axis.

12 4 5 8 Question 20 1 / 1 point 1244567777778999 (50 %) 0111 (50 %) Done After Cannot be detemined About the same Before The following data show the height (in inches) of a sample of students. 6770716171676968666567676471696767646269 Fill in the blanks to create a stem leaf plot for these data. Key is 6|3 = 63. Report values for Leaf column in increasing order and do not keep spaces or place commas between values. Stem Leaf 6 7 (a) (b) (a): (b)

MATH302 - Week 2 Knowledge Check Homework2

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