The date table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three teller windows. Test the claim the standard deviation of waiting tims is less than 2.1 minutes, which is the standard deviation of waiting times at the same bank when seperate waiting lines are used at each teller window. Use a significance level of 0.01 . Assume that the simple random sample selected from a normally distributed population. A. Identify the null and alternative hypotheses. B. Compute the test statistic x^2 = ____( round to two decimal places as needed ) c. What is the p-value

The date table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three teller windows. Test the claim the standard deviation of waiting tims is less than 2.1 minutes, which is the standard deviation of waiting times at the same bank when seperate waiting lines are used at each teller window. Use a significance level of 0.01 . Assume that the simple random sample selected from a normally distributed population. A. Identify the null and alternative hypotheses. B. Compute the test statistic x^2 = ____( round to two decimal places as needed ) c. What is the p-value

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter10: Sequences, Series, And Probability

Section10.8: Probability

Problem 32E

See similar textbooks

Similar questions

The management of the local zoo wants to know if all of their animal exhibits are equally popular. If there is significant evidence that some of the exhibits are not being visited frequently enough, then changes may need to take place within the zoo. A tally of visitors is taken for each of the following animals throughout the course of a week, and the results are contained in the following table. At α=0.005, determine whether there is sufficient evidence to conclude that some exhibits are less popular than others. Animal Exhibits at the Zoo Elephants Lions/Tigers Giraffes Zebras Monkeys Birds ReptilesNumber of visitors 152 175 185 144 145 171 163 Step 2 of 4 : Calculate the expected value for the number of visitors for the birds exhibit. Enter your answer as a fraction or a decimal rounded to three decimal places. Step 3 of 4: Compute the value of the test statistic. Round any calculations to at least six decimals places and round your final answer to three…
The manufacturer of large liquid crystal display (LCD) is difficult. Some defectsare minor and can be removed; others are unremovable. The number of unremovabledefects for each of n = 45 displays1 0 5 3 0 7 6 0 0 4 6 85 0 9 1 0 8 6 0 3 2 0 00 6 0 10 0 6 0 0 1 0 0 00 1 5 1 0 5 0 0 2has mean ̅ x= 2.667 and s = 3.057 unremovable defects. Conduct a test of hypothesis withthe intent of showing that the mean number of unremovable defects is less than 3.6. Take α= 0.025.
A doctor is called to see a sick child. Thedoctor has prior information that 90% of sick children in that neighborhoodhave the flu, while the other 10% are sick with 1 measles. Let F stand for anevent of a child being sick with flu and M stand for an event of a child beingsick with measles. Assume for simplicity that F ∪ M = Ω,i.e., that there no other maladies in that neighborhood. A well-known symptomof measles is a rash (the event of having which we denote R). Assume that theprobability of having a rash if one has measles is P(R | M) = 0.95. However,occasionally children with flu also develop rash, and the probability of havinga rash if one has flu is P(R | F) = 0.08. Upon examining the child, the doctorfinds a rash. What is the probability that the child has measles?
When the health dept. tested private wells in a county for 2 impurities commonly found in drinking water, it found that 20% of the wells had neither impurity, 30% had impurity A, 40% had impurity B, and 10% had both impurities. If 20 wells are randomly inspected from those in the county, find the prob. that 10 had neither impurity, 4 had impurity A, 4 had impurity B,and 2 had both impurities (rounded odd to 4 decimal places).. A. 0.0001 B. 0.1011 C. 0.2900 D. 0.9990
A random sample of 80 poultry farms of one variety gave an average production of 240 eggs per bird. Another random sample of 50 poultry farms of another variety gave an average production of 195 eggs per bird. At a=0.05 is there sufficient evidence to support that there is a significant difference between the egg production of the two varieties of birds. Assume o1 =18 eggs and o2=15 eggs
The management of the local zoo wants to know if all of their animal exhibits are equally popular. If there is significant evidence that some of the exhibits are not being visited frequently enough, then changes may need to take place within the zoo. A tally of visitors is taken for each of the following animals throughout the course of a week, and the results are contained in the following table. At α=0.05, determine whether there is sufficient evidence to conclude that some exhibits are less popular than others. Animal Exhibits at the ZooElephants Lions/Tigers Giraffes Zebras Monkeys Birds ReptilesNumber of visitors 137 129 161 147 160 134 131 Step 3 of 4 : Compute the value of the test statistic. Round any intermediate calculations to at least six decimal places, and round your final answer to three decimal places. Step 4 of 4: Draw a conclusion and interpret the decision. (Reject or fail to reject, Is there enough evidence or not?)
The management of the local zoo wants to know if all of their animal exhibits are equally popular. If there is significant evidence that some of the exhibits are not being visited frequently enough, then changes may need to take place within the zoo. A tally of visitors is taken for each of the following animals throughout the course of a week, and the results are contained in the following table. At α=0.05, determine whether there is sufficient evidence to conclude that some exhibits are less popular than others. Animal Exhibits at the Zoo Elephants Lions/Tigers Giraffes Zebras Monkeys Birds Reptiles Number of visitors 139 136 169 125 174 137 174 Copy Data Step 3 of 4 : Compute the value of the test statistic. Round any intermediate calculations to at least six decimal places, and round your final answer to three decimal places.
Suppose X follows a continuous uniform dis-tribution from 1 to 5. Determine the conditional probabilityP (X > 2.5|X ≤4)
A random sample of size n = 100 is taken from an infinite population with the mean μ = 75 and the vari-ance σ2 = 256. (a) Based on Chebyshev’s theorem, with what probabil-ity can we assert that the value we obtain for X will fall between 67 and 83? (b) Based on the central limit theorem, with what proba-bility can we assert that the value we obtain for X will fall between 67 and 83?
null/observed/alternative20/25/50%compatible/not compatibleinside/outside30/50/95is/is no https://learning.statistics-is-awesome.org/threethings/
A doctor claims that less than 75% of the patients that he performs a knee replacement surgery on return to work in the first 3 months after the operation. A sample of 50 patients that had a knee replaced by the doctor showed that only 34 of them returned to work within 3 months of the surgery. Test the doctor’s claim at the 0.05 level of significance.
John is an inspector at a New York clothier. He knows from keeping track of good and substandard clothing items that for the afternoon shift 4% of all clothing made will be substandard. If John checks 260 clothing items completed that shift, what is the probability that he will find more than 5% substandard items assuming all conditions for the central limit theorem are met.