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Give a real-world situation or problem; clearly identify the independent and dependent variables; give an explanation of whether an independent-samples or related-samples t test is most appropriate;
39% percent of households say they would feel secure if they had $50,000 dollars in savings. you randomly select 8 households and ask them if they would feel secure if they had $50,000 dollars in sa
Give an example of a situation when a confidence interval would be more appropriate than a point estimate.
Use the delta methold to show that an approximate variance of the log of the odds ratio is 1/a + 1/b + 1/c + 1/d.
Find the k that will minimize the expected number of test
68% of callers complain about service they receive from a call center. What is the probability two of the next three calls produce a complaint?
A shipment of 10 radios contains 3 defective sets. If the distributor obtains 4 of these sets, what is the probability that he will receive at least one of the defective sets?
The probability of exposure to the flu during an epidemic is 0.6. Experience has shown that a serum is 80% succesful in preventing an inoculated person from acquiring the flu, if exposed to it.
If you are task to distribute the questionnaire what will you do? Decide on the optimal sampling elements to be considered. Recommend a sampling design. Give justification.
Find the moment generating function and characteristic function of a geometric random variable X with parameter p. A geometric random variable with parameter p has probability mass function
Psychological statistics, Suppose you were going to create your own study to examine what course-delivery format (online, blended, or face-to-face) leads to the best performance in a psychological sta
Suppose you formulate a hypothesis and conduct an experiment, but the results were not significant. Can you gain information from that or has your experiment been a failure?
Five white balls and five black balls are distributed in two urns in such a way that each urn contains five balls. At each step we draw one ball from each urn and exchange them. Let Xn be the number
How many three-digit numbers can be formed from the digits 0, 1, 2, 3, 4, 5, and 6, if each digit can be used only once? How many of these are odd numbers?
A student took a chemistry exam where the exam scores were mound-shaped with a mean score of 90 and a standard deviation of 64. She also took a statistics exam where the scores were mound-shaped, th
A circuit board requires 9 different Integrated Circuits (IC). There are 4 vendors who manufacture these 9 kinds of ICs. They are Texas Instruments (TI), National Instruments (NI), Motorola (M), and
Which will have the largest value in a positively skewed distribution? Please provide an explanation for your answer.
Indicate which of the following distributions is probably negatively skewed and provide an explanation for your answer.
How does the surface area-to-volume ratio of a 1-mm cube compare to the surface area-to-volume ratio of a 3-mm cube?
A calculator has the random number generator button which, when pushed displays a random digit (0,1,2,3,.....9). The button is pushed four times. Assuming the number generated are independent, what
Make a point estimate of the population mean difference in accuracy performance for music versus no music in the classroom. Compute the 90% confidence interval for the population mean difference.
The data below gives the logarithm to the base 10 of the volume occupied by algal cells on succesive days, taken over a period for which the realtive growth rate is approximately constant:
At Western University the historical mean of scholarship examination scores for freshman applications is 920. A historical population standard deviation s = 165 is assumed known. Each year, the assi