df = 100- 1 = 99
Test statistic,
t = (xbar - mu)/(s/sqrt(n))
t = (7 - 7.5)/(2/sqrt(100))
t = -2.5
P-value Approach
P-value = 0.0141
0.05 > pvalue > 0.01
It would be larger
not enough information
-/5 POINTS MINTROSTAT9 7.E.521.XP. MY NOTES ASK YOUR TEACHER A simple random sample of 100 postal...
A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. The sample mean was x = 7 years with a standard deviation of s = 2 years. Assume the distribution of the time the employees have worked for the postal service is approximately Normal. The hypotheses being tested are H0: ! = 7.5 versus...
A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. The sample mean was 7 years with a standard deviation of s = 2 years. Assume the distribution of the time the employees have worked for the postal services is approximately normal. What is the rejection region for testing at α=.1 level of significance?...
A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. The sample mean was = 7 years with a standard deviation of s = 2 years. Assume the distribution of the time the employees have worked for the postal service is approximately Normal. The hypotheses being tested are H0: μ = 7.5 versus Ha:...
A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years, as recorded 20 years ago. The sample of the current employees gave a mean service time 7.9 years with a standard deviation of s = 2 years. Assume the distribution of the time the employees work in service jobs is approximately normal. What is this a one or...
3. -/3 points MINTROSTAT9 6.E.075. My Notes Ask Your Teacher v Computers in some vehicles calculate various quantities related to performance. One of these is the fuel efficiency, or gas mileage, usually expressed as miles per gallon (mpg). For one vehicle equipped in this way, the miles per gallon were recorded each time the gas tank was filled, and the computer was then reset. In addition to the computer's calculations of miles per gallon, the driver also recorded the miles...
what are the answers? 1. -/2 POINTS DEVORESTAT9 7.E.507.XP. MY NOTES ASK YOUR TEACHER A triathlon consisting of swimming, cycling, and running is one of the more strenuous amateur sporting events. An article reports on a research study involving nine male triathletes. Maximum heart rate (beats/min) was recorded during performance of each of the three events. For swimming, the sample mean and sample standard deviation were 186.0 and 7.5, respectively. Assuming that the heart-rate distribution is (approximately) normal, construct a...
e. None of these circumstances would prevent us trom using procedures t An SRS of 100 postal employees found that the average time these employees had worked for the postal service was 7years with standard deviation s 2 years. Assume the distribution of the time the population of employees have worked for the postal service is approximately Normal. Which of the following gives the correct 95% confidence interval for the mean time μ the population of postal service employees have...
55. Is the mean height of all adult American males between the ages of 18 and 21 now over 6 ft? In a sample of 100 randomly selected American males between the ages of 18 and 21 the average height was 6.1 it with a standard deviation of 0.21 ft. Which of the following is the appropriate alternative hypothesis? (A) H6 (B) Hu<6 (C) H.: >6 (D) H. :> 6.1 (E) None of these 56. A simple random sample of...
A random sample of 100 observations from a population with standard deviation 76 yielded a sample mean of 114. Complete parts a through c below. a. Test the null hypothesis that u = 100 against the alternative hypothesis that u > 100, using a = 0.05. Interpret the results of the test. What is the value of the test statistic? und to two decimal places as needed.) Find the p-value. p-value = (Round to three decimal places as needed.) State...
1. [-15 Points] DETAILS DEVORESTAT9 9.E.003.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Pilates is a popular set of exercises for the treatment of individuals with lower back pain. The method has six basic principles: centering, concentration, control, precision, flow, and breathing. An article reported on an experiment involving 88 subjects with nonspecific low back pain. The participants were randomly divided into two groups of equal size. The first group received just educational materials, whereas the second group participated in...