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Q1) Student believes that no more than 20% of students who finish statistics course get A. A random sample of 100 students was taken. 24 percent of students in the sample received A's.
a) Mention the null and alternate hypothesis.
b) Using a critical value, test hypothesis at the 1% level of significance.
c) What conclusion can you draw concerning the proportion of students receiving A's in course?
Q2) Average gasoline price of one of the major oil companies has been $1.00 per gallon. Since shortages in production of crude oil, it is believed that there has been a significant increase in the average price. In order to test this belief, we randomly selected a sample of 36 of the company's gas stations and determined that average price for stations in sample was $1.10. Suppose that standard deviation of population (s) is $0.12.
b) Test claim that prices have increased at the 5% significance level?
c) What conclusion can you draw about price of gasoline based on this test?
Use value you found in part a to find out degree of confidence for interval 65.65
Use the marginal probabilities of school quality, school cost or convenience, and other to comment on the most important reason for choosing a school.
With this information, by constructing a 2 by 2 table, compute the predicative value positive and predictive value negative of the ELA in hypothetical population of 1000000 blood donors.
A range of values constructed from sample data so that the parameter occurs within that range at a specified probability is:
If p denotes the p -value of the corresponding hypothesis test, which of the following is true?
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
Solve different inventory control problems using an appropriate OR method.
If a proposal evaluator randomly selected two proposals, what is the probability that both of them met the specified?
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma. The researcher found that Lincoln's educational score did not correlate with the expected variables. What was wrong?
An instructor claims the average time to take a statistics test is greater than 39 min. As, if a sample of 33 students took 43 min. is the instructor's claim true?
Elucidate the null and alternative hypothesis for the difference among the two means. In testing the difference between the means of two.
The researcher found that Lincoln's educational score did not correlate with the expected variables.
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