A team of researchers would like to find out if Country Xresidents, who favor a low fat diet, have significantly lowercholesterol levels compared to that of the US population. Theycollected data from a large sample of Country X residents and the Zstatistic is calculated to be -1.34 in a one-tailed test with analpha level of .05. What is the researchers' conclusion of thehypothesis test?
Group of answer choices
The researchers fail to reject the null hypothesis.
The researchers reject the alternative hypothesis.
The researchers reject the null hypothesis.
More information is needed to reach a conclusion.
A study was conducted on the effect of money on lifesatisfaction by comparing a group of people who are financiallywealthy to the general population. Based on the statistical result,the researchers failed to reject the null hypothesis, so it can beconcluded that ____.
Group of answer choices
the probability is high that the life satisfaction of people whoare wealthy is different from the general population
life satisfaction of people who are wealthy has been proven tobe the same as the general population
life satisfaction of people who are wealthy has been proven tobe different from the general population
the probability is high that the life satisfaction of people whoare wealthy is the same as the general population
Based on the national statistics on MPG ratings, the nationalaverage rating for sedans is 25 with a standard deviation of 5. Mycar has an MPG of 29, what is the percentage of sedans performingbetter than my car in MPG?
Group of answer choices
50 + 28.81% - 78.81%
50% - 28.81% = 21.19%
100% - 34.13% = 65.87%
100% - 34.13% = 65.86%
When using the Z table for a two-tailed hypothesis test with apreset alpha (significance) level, what is the correct sequence ofthe following steps (it is possible not all steps will beused):
1) Look for the corresponding Z value(s)
2) Multiply the percentage of alpha by 2 to be the \"tail areapercentage\"
3) Look in the \"tail\" column for the \"tail area percentageâ€
4) Divide the percentage of alpha by 2 to be the \"tail areapercentage\"
5) Convert the alpha to percentage
Group of answer choices
5, 4, 3, 1
5, 2, 3, 1
5, 4, 3, 1, 2
1, 2, 3
How does a two-tailed test compared to a one-tailed test whengiven a sample statistic and a fixed alpha level?
Group of answer choices
The critical value to be compared to the statistic would be lessextreme with a two-tailed test.
The critical value to be compared to the statistic would be moreextreme with a two-tailed test.
The total significance area in the comparison distribution islarger in a two-tailed test.
The total significance area in the comparison distribution issmaller in a one-tailed test.
