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At the beginning of the course of Statistical Methods I, the instructor recommended that students devote 3 hours per week for the duration of the 13-week semester, for a total of 39 hours. It is known that the times spent on studying statistics follow a normal distribution. Throughout the course's duration, students were claiming that they were following the instructor's recommendation. At the course's completion, a random sample of 10 students enrolled in the course was drawn where each student was asked how many hours he or she spent doing homework in statistics. The data are listed below:
45
38
37
40
44
46
42
43
While dealing with 16 students, suppose that the alternative hypothesis has been one-sided and that it was set as Ha : < 39. Make a graph to visualize the problem.
Describe what the researcher must do if one of the requirements is not met and give illustrations.
Similar survey of student population 10 years ago found that coffee shop was favoured by 20% of students, and pizza and hamburger were each preferred by 40% of the students. Determine the expected frequencies for chi-square test.
What is the probability that the first card dealt is an ace of spade?
Do the association between the sizes of the heads and bodies of the two species appear to be strong? Explain.
Which statement is true for a statistical study?
Variance of 4.2 and mean of 23.2 were calculated. Find out 95% confidence interval on mean and standard deviation. Describe any potential problems with this analysis.
If the standard deviation is $89.46, find the probability that a randomly selected customer spends between $550.67 and $836.94.
A certain airplane has two independent alternators to provide electrical power.
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
Determine the percent of the days is the price between $38.00 and $40.00?
There is no proof the new policy is more effective, but we cannot finish the policy has no effect on smog. Interpretation of P-value for the given context.
Can we conclude a difference in means? YES or NO (circle one)
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