Find whether the sample data indicate that the mean account balance has declined from $1,600.
Perform a hypothesis test to see whether the mean number of transactions per customer is more than 10 per month.
Check whether the mean number of transactions per customer is more than 9 per month.
Find whether there is any difference in the mean checking account balances among the four branches. Also find the pair of branches where these differences occur.
Check whether there is a difference in ATM usage among the four branches.
Find whether there is a difference in ATM usage between the customers who have debit cards and who do not have debit cards.
Find whether there is a difference in ATM usage between the customers who pay interest verses those who do not pay.
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STAT TECH IN BUSINESS & ECON LL\AC
- An Internet retailer would like to investigate the relationship between the amount of time in minutes a purchaser spends on its Web site and the amount of money he or she spends on an order. The table to the right shows the data from a random sample ofarrow_forwardThe histogram to the right shows the starting salaries (rounded to the nearest thousand dollars) for college graduates based on a random sample of recent graduates. Determine whether the following statement is true or false according to the graph. More college graduates had starting salaries in the $51,000-$55,000 range than in the $36,000-$40,000 range. Choose the correct answer below. Starting Salaries of Recent College Graduates Number of Graduates (frequency) 350 300 250 200 150 100 50 0 Salary (thousands of dollars) 61-65 OA. False, because the bar for 51-55 has the same height as the bar for 36-40. OB. True, because the sum of the heights of the first two bars in the graph is greater than the sum of the heights of the last two bars. OC. False, because the bar for 51-55 is shorter than the bar for 36-40. OD. True, because the bar for 51-55 is taller than the bar for 36-40.arrow_forwardTwo different surveys will be conducted to estimate the mean salary of employees who have taken a statistics course. If the first survey has a lager sample size than the second survey, the first survey will result in a sample mean that is closer to the population mean ( when compared with the second survey). Decide whether the statement make sense or not. Explain clearly.arrow_forward
- Dean suspects that statistics teacher increase the grades of the class of 75 students due to his endless love to his beloved students. Dean realized that average grade of previous statistics classes is 64 and she took some of the exams from student affairs departments and note the following grades: 65 75 98 34 76 52 80 84 68. Please help dean to conduct a statistical analysis and interpret the results.arrow_forwardSuppose your statistics instructor reports test grades as z-scores, and you got a score of on an exam. Write a sentence explaining what this means.arrow_forwardA website recently reported that salaries of Chief Finance Officers (CFOs) ranged from $127,735 to $209,981 (before bonuses). Suppose the data below represent a sample of the annual salaries for 24 CFOs in thousands of dollars. Complete parts a through c. 203.4 186.4 184.9 169.2 194.8 176.9 146.8 192.8 202.4 149.3 179.1 185.6 184.4 134.4 201.8 189.6 176.5 151.3 204.6 187.1 206.3 162.6 208.5 142.6 a. Using 9 classes, construct a cumulative frequency distribution. (Use the minimum class width, rounded up to the nearest integer. Start the first class at 134.) Complete the cumulative frequency distribution below. (Simplify your answers.) CFO Salary (thousands of Cumulative Frequency dollars) and underarrow_forward
- A study is planned to compare the proportion of teenagers (ages 13–19) who dislike anchovies with the proportion of young adults (ages 20–30) who dislike anchovies. A random sample of 41 teenagers was taken, and 78% of them disliked anchovies. A random sample of 56 young adults was also taken, and 71% of them disliked anchovies. Difference = Teenagers - Young Adults The picture below is the question. Use the information above to help.arrow_forwardA study is planned to compare the proportion of teenagers (ages 13–19) who dislike anchovies with the proportion of young adults (ages 20–30) who dislike anchovies. A random sample of 41 teenagers was taken, and 78% of them disliked anchovies. A random sample of 56 young adults was also taken, and 71% of them disliked anchovies. Difference = Teenagers - Young Adults The picture below is the question. Use the information above to help.arrow_forwardWhat does the histogram tell you about the ages at which women gave birth in 2015? The distribution of ages at which women gave birth is slightly skewed to the left. Women between the ages of 28 and 30 gave birth more often than any other age group. No woman over the age of 46 gave birth in 2015. Five women between the ages of 44 and 46 gave birth in 2015.arrow_forward
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