Exam 6: Putting Statistics to Work

Find the range for the given data. -Rich Borne is currently taking Chemistry 101. On the five laboratory assignments for the quarter, he got the following scores. 29 36 17 43 60

Provide an appropriate response. -If a hypothesis test is conducted at a significance level of 0.05, which of the following statements is true?

Provide an appropriate response. -A hypothesis test is conducted with the following hypotheses: Null hypothesis: population mean $= 100$ Alternative hypothesis: population mean $> 100$ A sample is selected and the sample mean turns out to be 118 If the result is significant at the $0.01$ level, which of the following is true?

Answer the question. -Tell which of the following distributions would have the most variation.

Use the 68-95-99.7 rule to solve the problem. -Scores on a test are normally distributed with a mean of 101 and a standard deviation of 20. What percentage of scores are greater than 161?

Solve the problem. -The grocery expenses for six families were $43.84, $71.11, $79.58, $88.66, $72.70, and $77.99. Compute the mean grocery bill. Round your answer to the nearest cent.

Find the standard deviation for the given data. Round your answer to one more decimal place than the original data. -The numbers listed below represent the amount of money that Tom has saved in each of the last 8 months. \ 278 \ 441 \ 244 \ 384 \ 337 \ 348 \ 362 \ 207 Compute the standard deviation.

Answer the question. -Tell which of the following distributions would have the most variation.

Use the range rule of thumb to approximate the standard deviation. - 3.5 1.6 2.4 3.7 4.1 3.9 1.0 3.6 4.2 3.4 3.7 2.2

Find the range for the given data. -Each student in a sixth-grade class recorded the amount of time he or she had spent watching television during a one-week period. The times (in hours)are listed below. 18.1 22.7 8.5 26.5 17.7 29.9 21.7 13.1 25.0 24.6

State whether you think the difference between what occurred and what you would expect by chance is statisticallysignificant. -Of the people taking the medication, 38 out of 100 noticed improvement in their arthritis. Of the people taking the placebo, 35 out of 100 noticed improvement in their arthritis.

Provide an appropriate response. -Which of the following is not possible?

Find the margin of error for the survey results described. -In a survey of 125 adults, 30% said that they had tried acupuncture at some point in their lives. Give your answer as a decimal to three decimal places.

State whether you would expect the data set to be normally distributed. -Amount of credit card debt of families in the U.S.

Solve the problem. -Scores on a test are normally distributed with a mean of 72 and a standard deviation of 5. What is the percentile for an exam score of 84? Round the percentile to the nearest tenth.

Construct a boxplot as requested. -Here are the ages of the male and female employees at First River Bank. Draw a box plot for each of the two data sets. Males Age Females Age Mike 18 Kellie 21 Steven 19 Lauren 21 Jeff 21 Pat 23 Kevin 21 Beth 26 Robert 24 Stacy 26 Jason 26 Tracie 28 Dean 27 Meredith 29 Roy 28 Tiffany 35 Ronald 29 Jackie 37

Solve the problem. -Suppose that the mean salary in a particular profession is $45,000 with a standard deviation of $2,000. What percentage of people in that profession earn less than $48,000?

State whether you think the difference between what occurred and what you would expect by chance is statisticallysignificant. -At Linden High School there are math tests at the end of each three-month session. On all of the last 10 days when there was a math test at school, Brian got a cold and had to stay home. He didn't Have colds at other times.