A state Department of Transportation claims that the mean wait time for various services at its different location is more than 6 minutes. A random sample of 16 services at different locations has a mean wait time of 9.5 minutes and a standard deviation of 7.3 minutes. At α=0.01, can the department’s claim be supported assuming the population is normally distributed?

Suppose that one-way commute times in a particular city are normally distributed with a mean of 25.16 minutes and a standard deviation of 1.45 minutes. Would it be unusual for a commute time to be above 21 minutes?

The board of a major credit card company requires that the mean wait time for customers when they call customer service is at most 4.00 minutes. To make sure that the mean wait time is not exceeding the requirement, an assistant manager tracks the wait times of 57 randomly selected calls. The mean wait time was calculated to be 4.36 minutes. Assuming the population standard deviation is 1.29 minutes, is there sufficient evidence to say that the mean wait time for customers is longer than 4.00 minutes with a 95 % level of confidence? Step 3 of 3: Draw a conclusion and interpret the decision. E Tables E Keypad Answer Keyboard Shortcuts We fail to reject the null hypothesis and conclude that there is sufficient evidence at a 95 % level of confidence to support the claim that the mean wait time is longer than 4.00 minutes. {1} We reject the null hypothesis and conclude that there is sufficient evidence at a 95 % level of confidence to support the claim that the mean wait time is longer…

The board of a major credit card company requires that the mean wait time for customers when they call customer service is at most 4.50 minutes. To make sure that the mean wait time is not exceeding the requirement, an assistant manager tracks the wait times of 52 randomly selected calls. The mean wait time was calculated to be 4.71 minutes. Assuming the population standard deviation is 0.82 minutes, is there sufficient evidence to say that the mean wait time for customers is longer than 4.50 minutes with a 98% level of confidence?   Step 1 of 3 :   State the null and alternative hypotheses for the test. Fill in the blank below.

The manufacturer of Suzanne Space Saver tables finds that the mean time needed by online buyers to assemble the tables is 1 hour with a standard deviation of 0.25 hours. The design team of the firm has developed a new manual to reduce the time needed to assemble the table by its buyers. To test the effectiveness of the new manual, the team selects and gives 20 buyers the new manual to use. The sampled buyers take a mean of 0.45 hours to assemble each table. Assuming that the population is normally distributed, and using the 0.05 level of significance, determine and interpret the p value for the test and state whether we should conclude that the new manual is effective.

The board of a major credit card company requires that the mean wait time for customers when they call customer service is at most 3.00 minutes. To make sure that the mean wait time is not exceeding the requirement, an assistant manager tracks the wait times of 43 randomly selected calls. The mean wait time was calculated to be 3.28 minutes. Assuming the population standard deviation is 0.87 minutes, is there sufficient evidence to say that the mean wait time for customers is longer than 3.003.00 minutes with a 95% level of confidence?   Step 1 of 3 :   State the null and alternative hypotheses for the test. Fill in the blank below. H0: μ=3.00: Ha: μ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯3.00

Suppose the mean wait-time for a telephone reservation agent at a large airline is 42 seconds. A manager with the airline is concerned that business may be lost due to customers having to wait too long for an agent. To address this concern, the manager develops new airline reservation policies that are intended to reduce the amount of time an agent needs to spend with each customer. A random sample of 250 customers results in a sample mean wait-time of 41.3 seconds with a standard deviation of 4.2 seconds. Using a = 0.05 level of significance, do you believe the new policies were effective in reducing wait time? Do you think the results have any practical significance? www Determine the null and alternative hypotheses. Ho: P = 42 seconds. H₁: H <42 seconds Calculate the test statistic. = (Round to two decimal places as needed.) Check answer Get more help. Clear all (3) a 1:44 AM 6/19/2022 O pr BSC 7 Help me solve this View an example H Type here to search " "? * 3 Z @ 12 S E C 4 R F %…

The exchange commission recently reported that the average age of a female shareholder is 44. A broker in Vancouver wants to know whether this figure applies to the female shareholders in Vancouver. The broker secures a master list of shareholders in Vancouver and takes a random sample of 58 women. Suppose the average age for shareholders in the sample is 45.1 years, with a population standard deviation of 8.7 years. Test to determine whether the broker sample data from Vancouver differ significantly enough from the exchange commission claim. Use a=0.05 if in fact true age of shareholders is 45 not 44 then what is the brokers probability of committing a type II error l: please find: null Ho null Ha graph tail right left or 2 tailed distribution (Z, t, X^2, or F) left and right critical value: calculated value : conclusion: probability of making type II error:

A leasing firm claims that the mean number of miles driven annually, u, in its leased cars is less than 13,420 miles. A random sample of 42 cars leased from this firm had a mean of 13,191 annual miles driven. It is known that the population standard deviation of the number of miles driven in cars from this firm is 3460 miles. Assume that the population is normally distributed. Is there support for the firm's claim at the 0.05 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.) (a) State the null hypothesis H, and the alternative hypothesis H,. p H, :0 H :0 (b) Determine the type of test statistic to use. (Choose one) ▼ D=0 OSO (c) Find the value of the test statistic. (Round to three or more decimal places.) O

Suppose the mean wait-time for a telephone reservation agent at a large airline is 40 seconds. A manager with the airline is concerned that business may be lost due to customers having to wait too long for an agent. To address this concern, the manager develops new airline reservation policies that are intended to reduce the amount of time an agont needs to spend with each customer. A random sample of 250 customers results in a sample mean wait-time of 39.1 seconds with a standard deviation of 4.2 seconds. Using a=0.05 level of significance, do you believe the new policies were effective in reducing wait time? Do you think the results have any practical significance? 6-7 (Round to two decimal places as needed.) Calculate the P-value. P.value = Round to three decimal olaces as needed.) ick to select your answer(s).