A manager is interested in determining if the population standard deviation has dropped below 138. Based on a sample of n = 19 items selected randomly from the population, conduct the appropriate hypothesis test at a 0.10 significance level. The sample standard deviation is 130.
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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![A manager is interested in determining if the population standard deviation has dropped below 138. Based on a sample of n = 19 items selected randomly from the
population, conduct the appropriate hypothesis test at a 0.10 significance level. The sample standard deviation is 130.
Determine the null and alternative hypotheses.
O A. Ho: o2 < 138
На: а22 138
О В. Но: о2 138
HA: o2 + 138
O C. Ho: o2 19,044
HA: 02 < 19,044
O D. Ho: o2 < 19,044
HA: o2 2 19,044
State the decision rule. Select the correct choice below and, if necessary, fill in any answer boxes to complete your choice.
(Round to four decimal places as needed.)
O A. If the test statistic, x2 > x12 =
reject H, or if the test statistic, x < x - a/2 =
reject Ho. Otherwise, do not reject Ho
B. If the test statistic, x <x-a
reject Ho. Otherwise, do not reject Ho.
C. If the test statistic, x2 > x =
reject Ho. Otherwise, do not reject Ho.
Find the test statistic, x.
(Round to two decimal places as needed.)
Choose the correct conclusion below.
O A. Do not reject Ho. There is sufficient evidence that the population standard deviation is less than 138.
O B. Do not reject Ho. There is insufficient evidence that the population standard deviation is less than 138.
OC. Reject Ho. There is sufficient evidence that the population standard deviation is less than 138.
O D. Reject Ho. There is insufficient evidence that the population standard deviation is less than 138.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F87be0542-a9fd-474b-a745-43a2181cdcf5%2F8e4ec658-ff01-4240-93d6-30905b045ae1%2Fs71v0nj_processed.png&w=3840&q=75)
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