a)
The test statistic is
At alpha = 0.05, the critical values are
Since the test statistic value lies between the critical values (11.6886 < 24.757 < 38.0756), so we should not reject the null hypothesis.
At 0.05 significance level, there is sufficient evidence to conclude that minutes.
b)
The test statistic is
At alpha = 0.05, the critical value is = 35.1725
Since the test statistic value is not greater than the critical value (24.757 < 35.1725), so we should not reject the null hypothesis.
At 0.05 significance level, there is sufficient evidence to conclude that minutes.
Question 2: Testing a variance A call center is concerned that call durations for a customer...
A call center is concerned that call durations for a customer service representative are too erratic: high variations is call durations can lead to customer dissatisfaction who have to wait longer for a resolution. The company has collected data from 24 randomly selected phone calls from that specific customer representative and found that s = 4.15 minutes. Answer the following questions. (a) Is there enough evidence to suggest that σ = 4 minutes? Use α = 0.05. (b) Assume that...
A call center company requires it's operators to answer the phone in an average time of 0.17 minutes or less. A sample of 32 actual operator times were collected and the results were a mean time of 0.173 minutes and a standard deviation of 0.0183 min. Is this sample mean response time statistically higher than the standard? What can you conclude? Assume alpha = 0.05 Select one: a. There is statistical evidence that the mean response time exceeds the standard....
The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call in and get answers to questions as they prepare their tax returns. In recent years, the IRS has been inundated with taxpayer calls and has redesigned its phone service as well as posting answers to frequently asked questions on its website (The Cincinnati Enquirer, January 7, 2010). According to a report by a taxpayer advocate, callers using the new system can expect to wait on hold...
The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call in and get answers to questions as they prepare their tax returns. In recent years, the IRS has been inundated with taxpayer calls and has redesigned its phone service as well as posting answers to frequently asked questions on its website (The Cincinnati Enquirer, January 7, 2010). According to a report by a taxpayer advocate, callers using the new system can expect to wait on hold...
Nationally, patients who go to the emergency room wait an average of 6 hours to be admitted into the hospital. Do patients at rural hospitals have a higher waiting time? The 13 randomly selected patients who went to the emergency room at rural hospitals waited an average of 7.9 hours to be admitted into the hospital. The standard deviation for these 13 patients was 2.2 hours. What can be concluded at the the a = 0.05 level of significance level...
You may need to use the appropriate appendix table or technology to answer this question The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call in and get answers to questions as they prepare their tax returns. In recent years, the IRS has been inundated with taxpayer calls and has redesigned its phone service as well as posted answers to frequently asked questions on its website.t According to a report by a taxpayer advocate, callers using...
-We focus on the behavioural consequences of satisfaction that relate to profit Three key behav ioural measures: 1. Customer retention; This is measured as: • Repeat purchase with durables such as cars • Continuity of use with utilities and a v ariety of serv ice prov iders 2. Share of category requirement (SCR) This is the proportion of category spending that goes to a particular brand This applies in repertoire categories such as groceries, hotels and supermarkets 3. Voice •...
objective question What is the mode and the mean for the following set of numbers? {4,9,8,2,16,4,4,8,9,6} O A. Mean = 7, mode =8 O B. Mean = 7, mode =4 O C. Mean = 6, mode =8 O D. Mean = 8, mode =9 You are conducting a survey of the people of the United Kingdom to find out how popular the racket sports are. You randomly choose people to call, and make 1,000 phone calls to people scattered across...
STA2221 examples on CI & Testing of Hypothesis Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answer the question Provide an appropriate response. 1) Find the critical value,te for 0.99 and n-10. A) 3.250 B) 3.169 1.833 D) 2.262 2) Find the critical value to forc=0.95 and n=16. A) 2.947 B) 2.602 2120 D) 2.131 3) Find the value of E, the margin of error, for A) 1.69 B) 0.42 0.99, n=16 and s=2.6. C)...
photos for each question are all in a row (1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...