Homework Answers
Single sample is drawn to test claim of Process average, and also population standard devaiation is not known, but here sample size is 100, so t test will be equivalent to z test for single mean for such large sample size , hence 3rd option is correct, one sample z test for mean.
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A life insurance company has recently restructured jobs in their claims processing division. A main goal...
Allstate Insurance is one of the major automobile insurance companies in the country. Recently, the western...
Allstate Insurance is one of the major automobile insurance companies in the country. Recently, the western region claims manager instructed an intern in her department to test if there exists any difference between the mean years that male customers have been insured by Allstate versus female customers. The intern randomly selected 13 male and 13 female customers from the account records and the summary is given below (rounded to the nearest year). Sample Mean - Male = 12, Sample Variance...
A paint company claims their paint will be completely dry within 45 minutes after application. Recently,...
A paint company claims their paint will be completely dry within 45 minutes after application. Recently, customers have complained dryingtimes are longer than the claimed 45 minutes. A consumer advocate group takes a random sample of 25 paint specimens and records their drying times. The average drying time x is 50. Consider dryng time, for all test specimens, to be normally distributed with σ = 9. Suppose the claimed drying time is true, that is μ answer to four decimal...
An insurance company has business objectives of reducing the amount of time it takes to approve...
An insurance company has business objectives of reducing the amount of time it takes to approve applications for life insurance. During a period of one month, you collect a random sample of 27 approved policies and the total processing time, in days, stored in insurance are: 73 19 16 64 28 28 31 90 60 56 31 56 22 18 45 48 17 17 17 91 92 63 50 51 69 16 17 A. On the past, the mean processing...
7. A Manufacturing group mass produces one product. It has 10 manufacturing locations and the manager...
7. A Manufacturing group mass produces one product. It has 10 manufacturing locations and the manager of each location only reports the average quantity made per location each week. There are 9 production lines per location and each average reported is made up of one individual data point per production line. The Corporate Operations Manager claims to have made improvements that increased output. The historical corporate-wide output reported per line is 10,510 units with a standard deviation of 450 units....
During a period of one month, a random sample of 27 approved life insurance policies is...
During a period of one month, a random sample of 27 approved life insurance policies is selected, and the total processing time, in days, is recorded as shown in the data table below. Complete parts (a) through (d). In the past, the mean processing time was 46 days. At the 0.05 level of significance, is there evidence that the mean processing time has changed from 46 days? State the null and alternative hypotheses. Determine the test statistic. The test statistic...
Only 6 and 7 s of t ll retail outlets across the nation stating that e...
Only 6 and 7
s of t ll retail outlets across the nation stating that e He obtained profits for the first week in July from 45 stores and found a mean of or the outlets averaged $22,50o. The manager for the store in Topeka questions $23, hypothesis that the population mean is $22,500. 790 with a standard deviation of $12,500. At the 1% level of significance test the 6. The manager for Dudley Construction thinks that on the average...
2. (20 points) A bank has been receiving complaints from real estate agents that their customers...
2. (20 points) A bank has been receiving complaints from real estate agents that their customers have been waiting too long for mortgage confirmations. The bank prides itself on its mortgage application process and decides to investigate the claims. The bank manager takes a random sample of 20 customers whose mortgage applications have been processed in the last 6 months and finds the following wait times (in days) 5.7, 22, 4, 12, 9, 9, 14, 3, 6, 5, 15, 10,...
Tire Life Prompt: A major tire manufacturer claims their heavy-duty truck tires have an average usage...
Tire Life Prompt: A major tire manufacturer claims their heavy-duty truck tires have an average usage life of 71,000 miles. The shipping department of the company you work for has been using these tires for several years and feels they are not getting the mileage promised. The manager pulled 25 maintenance records and found an average tire life of 68,050 miles, with a standard deviation of 11,602 miles. He asks you to conduct a test of hypothesis to determine if...
Question 10 Background: Name That Scenario: Pet Adoption One important aspect in statistics is to understand...
Question 10 Background: Name That Scenario: Pet Adoption One important aspect in statistics is to understand which statistical methods or procedures are appropriate to use to address the research problem or question of interest. For each description of a research question below, select the one corresponding statistical analysis technique most appropriate for addressing that research question. An employee who has just been put in charge of the pet adoption fundraiser thinks that a personal phone cal to recent adopters asking...
The data entry operation in a large computer department claims that it gives its customers a...
The data entry operation in a large computer department claims that it gives its customers a turn around time of 10 hours on average. The National Consumer Agency acting on behalf of customers analyses a random sample of jobs recently completed by the department and produces the following output using SPSS : One-Sample Statistics N Mean Std. Deviation Std. Error MeanTime Time 14 10.32 1.70 (i) One-Sample Test Test Value = 10 95% Confidence Interval of the Difference t df...
A paint company claims their paint will be completely dry within 45 minutes after application. Recently, customers have complained dryingtimes are longer than the claimed 45 minutes. A consumer advocate group takes a random sample of 25 paint specimens and records their drying times. The average drying time x is 50. Consider dryng time, for all test specimens, to be normally distributed with σ = 9. Suppose the claimed drying time is true, that is μ answer to four decimal...
Only 6 and 7
s of t ll retail outlets across the nation stating that e He obtained profits for the first week in July from 45 stores and found a mean of or the outlets averaged $22,50o. The manager for the store in Topeka questions $23, hypothesis that the population mean is $22,500. 790 with a standard deviation of $12,500. At the 1% level of significance test the 6. The manager for Dudley Construction thinks that on the average...
2. (20 points) A bank has been receiving complaints from real estate agents that their customers have been waiting too long for mortgage confirmations. The bank prides itself on its mortgage application process and decides to investigate the claims. The bank manager takes a random sample of 20 customers whose mortgage applications have been processed in the last 6 months and finds the following wait times (in days) 5.7, 22, 4, 12, 9, 9, 14, 3, 6, 5, 15, 10,...
Tire Life Prompt: A major tire manufacturer claims their heavy-duty truck tires have an average usage life of 71,000 miles. The shipping department of the company you work for has been using these tires for several years and feels they are not getting the mileage promised. The manager pulled 25 maintenance records and found an average tire life of 68,050 miles, with a standard deviation of 11,602 miles. He asks you to conduct a test of hypothesis to determine if...
Question 10 Background: Name That Scenario: Pet Adoption One important aspect in statistics is to understand which statistical methods or procedures are appropriate to use to address the research problem or question of interest. For each description of a research question below, select the one corresponding statistical analysis technique most appropriate for addressing that research question. An employee who has just been put in charge of the pet adoption fundraiser thinks that a personal phone cal to recent adopters asking...
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