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Question 1
Suppose that we have ratings of a restaurant from a sample of 72 customers. Each of the ratings is either "poor," "fair," "good," or "very good," Please state and then explain which of the following two options is more suitable to test whether the typical rating is "good": A hypothesis test for the population mean or a hypothesis test for the population median?
Question 2
Suppose that 14 individuals take a two-day course that is supposed to improve their knowledge of Web page design, which is rated as "not proficient," "proficient," or "advanced proficient." Of the 14 individuals in the sample, 12 are rated higher after the course than before, 1 individual is rated lower, and 1 individual's assessment is unchanged. Using a significance level of 0.05, can we conclude from this information that the course is successful in improving individuals' knowledge of Web page design?
Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations of X and Y.
What is the Chi-square test? Where can you apply it? Please site an example of how it was used and the outcome of the test. I think this could help me better than the book, it is difficult to understand.
Simulate arrival of cars at service station for one hour using different stream of random numbers from those used in (a), and calculate average time between arrivals.
Test whether there is any change in IQ after the training program. (The absolute value of t for 4 degrees of freedom at 1% level for one-tailed and two tailed tests are 3.747 and 4.604 respectively.
Find the first order statistics at time instance 3. Find the probability at time instance k,the person is at the location m steps to the right of the origin.
you are required to provide a portfolio of 3000 words comprising two equal elements as followspart onethis will
a researcher has found that pilots taking an over the counter antihistamine have poor reaction times. they performed an
according to an fda research every fourth egg has salmonella bacteria. an inspector checked 4 eggs what is the
At the .05 level of significance, is there evidence that that the proportion of delayed Southwest Airlines departures from Phoenix in January 2008 is greater than 25%? State the decision in terms of the problem.
There are infinitely many prime numbers p of the form 4n+3. In other words, show that there exist infinitely many positive integers, n, such that the number 4n+1 is prime.
using the clues given below fill in the rest of the joint distribution. there is only one answer.y x0 3 61
If the process mean remains at 12.05 oz, what must the standard deviation be so that 99% of the cans will contain 12 oz or more?
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