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Q1) Median can be a more suitable measure of central tendency than mean if distribution of the data is extremely skewed.
a) False
b) True
c) It does not matter, when data are skewed mean and median are the same
d) It does not matter, when data are skewed the mean, median, and mode are the same
Q2) According to Chebyshev's theorem, proportion of values from data set which is further than two standard deviations from the mean is at most:
a) 0.50
b) 0.13
c) 1.00
d) 0.25
Q3) In study of elephants researcher desires to find out average weight of certain subspecies of elephants. From earlier studies, standard deviation of weights of elephants in this subspecies is known to be= 1500 pounds. How many elephants does researcher require to weigh so that he can be 80% confident that average weight of elephants in his sample is within 350 pounds of true average weight for this subspecies?
a) 31
b) 39
c) 50
d) 166
Store used ANOVA to test if mean sales for each credit card were equal. What are the degrees of freedom for F statistic?
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Determine the probability that between 5 and 10 minutes will pass between successive occurrences.
Identify each of the following variables are qualitative or quantitative
What does null hypothesis for repeated-measures hypothesis test state?
At the 0.05 level of significance, is there sufficient reason to believe that the integers are not being generated uniformly?
Does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket?
In exercise identify (a) sample and (b) population. Also, find whether sample is likely to be representative of population.
A point estimate for the difference between the mean purchases of the users of the two credit cards is:
By using the normal distribution to approximate the desired probability.
Assume that you choose a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
Test the claim that the Snickers bars have a mean weight that is different than 20.1 grams. Because shutting down the plant is very expensive, test the claim at the .01 level of significance.
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