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kp2078
21.03.2020 •
Mathematics
A news article reports that "Americans have differing views on two potentially inconvenient and invasive practices that airports could implement to uncover potential terrorist attacks." This news piece was based on a survey conducted among a random sample of 1,137 adults nationwide, interviewed by telephone November 7-10, 2010, where one of the questions on the survey was "Some airports are now using ‘full-body’ digital x-ray machines to electronically screen passengers in airport security lines. Do you think these new x-ray machines should or should not be used at airports?" Below is a summary of responses based on party affiliation :
Party Affiliation
Republican Democrat Independent
Should 264 299 351
Answer Should Not 38 55 77
Dont Know/ No Answer 16 15 22
Total 316 369 450
(SHOW ANY WORK)
(a) Conduct an appropriate hypothesis test evaluating whether there is a difference in the proportion of Republicans and Democrats who think the full-body scans should be applied in airports. Assume that all relevant conditions are met.
(b) The conclusion of the test in part (a) may be incorrect, meaning a testing error was made. If an error was made, was it a Type 1 or a Type 2 Error? Explain.
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Ответ:
(a) there is a little difference in proportion clearly from the data given as observed.
(B) if a conclusion In the test part (a) is incorrect then a type 1 error was made.
Step-by-step explanation:
In statistical hypothesis testing:
type I error is the rejection of a true null hypothesis while
a type II error is the non-rejection of a false null hypothesis.
Ответ:
for 4x = 20 you have to use the division property of equality divide 20 by 4
for x - 11 = 9 you have to use the addition property of equality add 9 to 11
for 5x + 6x = 22 you have to combine like terms add 5x and 6x to make 11x
for 5(x – 2) = 30 you have to use the distributive property multiply 5 and x; 5 and -2
4x = 20; x = 5
x - 11 = 9; x = 20
5x + 6x = 22; 11x = 22; x = 2
5(x – 2) = 30; 5x - 10 = 30; x = 8