question 12 please A manufacture guarantees that its new drug reduces systolic b
ID: 3178377 • Letter: Q
Question
question 12 please
A manufacture guarantees that its new drug reduces systolic blood pressure (SBP in millimeters of mercury). The test results are shown in the table below. At significance level of 0.05, can you reject the manufacture's claim? Find critical F-values for right- and left-tailed test using the indicated level of significance alpha and degrees of freedom dfN and dfD: (a) alpha = 0.05, dfN = 9, dfD = 16; (b) alpha = 0.01, dfN = 5, dfD = 11; (c) alpha = 0.025, dfN = 7, dfD = 5. A manager is designing a system that is intended to decrease the standard deviation of the time customers waiting for service. Under old system, a random sample of 10 customers had the standard deviation of 20min. Under new system, a random sample of 21 customers had the standard deviation of 16min. At alpha = 0.10, is there enough evidence to convince the manager to switch to the new system? Assume both populations are normally distributed. A study of 150 randomly selected occupants in passenger cars and 200 randomly selected occupants in pickup trucks shows that 86% of occupants in passenger cars and 74% of occupants in pickup trucks wear seat belts. At alpha 0.10, can you reject the claim that the proportion of occupants who wear seat belts is the same for passenger cars and pickup trucks?Explanation / Answer
from F distribution table
critical values are as follows:
a) right tail :2.5377 ; left tail :0.3346
b)right tail :5.316 ; left tail:0.1004
c)right tail:6.853 ; left tail :0.1892
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