2. (20 points) A bank has been receiving complaints from real estate agents that their customers...
9.8 Test for one variance (Optional) The variance in the number of employees needed daily in a certain pharmacy has been 4. After the pharmacy changed its general manager, the variance is thought to have changed. To test it, a sample of the number of employees required per day for 15 days. Do a hypothesis test (two tailed) for the variance is with a confidence of 80% State the hypothesis. Find the left critical value (Use chi square table) Find...
Statistics inferential 1] An executive at the First National Bank is concerned that the bank is losing customers because mortgage applications are taking too long to be processed. The national average, according to an industry newsletter, is 6.5 business days. If the executive determines that the bank is taking longer than the national average then she will make major changes, including demoting or firing the manager of the mortgage department, even though he has an excellent work history with the...
Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with σ = 2.9%. A random sample of 10 bankstocks gave the following yields (in percents). 5.7 4.8 6.0 4.9 4.0 3.4 6.5 7.1 5.3 6.1 The sample mean is x = 5.38%. Suppose that for the entire stock market, the mean dividend yield is μ = 4.9%. Do these data indicate that the dividend yield of all bank...
QUESTION 20 A local diner would like to see an increase in the number of customers over the lunch hour. Currently, they average 25 customers per day over the lunch hour. They decide to offer a special menu of lunch deals at reduced rates to try to bring in more customers. Following the introduction of the new special lunch menu, they track data over the course of 24 days and find a sample mean of 35.6 customers with a standard...
10 springs have been tested and have had their spring constant recorded. This data has been provided in a csv file 10.051, 9.5551, 9.806, 9.9991, 10.191, 10.259, 9.8472, 9.4386, 9.4493, 9.5575 1. Using MATLAB, import the data using csvread and determine the sample mean and variance using in built functions is fine)(finished) 2. Determine the 95% confidence interval for the spring constant of the springs finished) x = csvread("values csv") m = mean(x); v = var(x); sprintf ("Mean is %f...
Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with o = 2.9%. A random sample of 10 bank stocks gave the following yields (in percents). 5.7 4.8 6.0 4.9 4.0 3.4 6.5 7.1 5.3 6.1 The sample mean is x = 5.38%. Suppose that for the entire stock market, the mean dividend yield is u = 5.0%. Do these data indicate that the dividend yield of all...
Child Health and Development Studies (CHDS) has been collecting data Type numbers in the boxes. about expectant mothers in Oakland, CA since 1959. One of the 10 points measurements taken by CHDS is the weight increase in pounds) for expectant mothers in the second trimester. In a fictitious study, suppose that CHDS finds the average weight increase in the second trimester is 14 pounds. Suppose also that, in 2015, a random sample of 33 expectant mothers have mean weight increase...
1) Compute the Population Mean, Variance and standard Deviation of the 20 men in seconds the subjects stayed balanced. 2) Identify a random sample of 10 men and find the sample mean (avaerage balance time in seconds) 3) Find he Median number of days per week exercised. 4) Find the Mode of the favorite exercise. 5) Construct a complete hypothesis test and determine if the two groups (population mean vs sample mean) have significantly different balance using Alpha Level ->...
My Notes -/20 polnts 2. BBBasicStat8Acc 9.1.019. Ask Your Teach 1.9 % . A random sample of 10 bank stocks gave the following yields (in percents) Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with o 5.7 4.8 6.0 4.9 4.0 3.4 6.5 7.1 5.3 6.1 The sample mcan is x 5.38%. Suppose that for the entire stock market, the mean dividend yicld is 4.7 %. Do...
A consumer agency has compiled grocery bills (in dollars) from random samples of supermarket customers in Florida and Georgia. Assuming the population variances are not equal, use the Excel output below to identify whether each of the following conclusions is correct. You must make a selection for each option. Click once to place a check mark for correct answers and click twice to place an "x" for the wrong answers. At the 2.5% significance level, conclude that the average grocery...