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Blood tests showed a sample mean of 8.1 pH with sample standard deviation s = 0.6 pH. Use a 5% level of significance to test the claim that the drug has changed (either way) the mean pH of the blood.
She wants to choose the passing grade such that the probability of passing a student who guesses on every question is less than 1/10. What score should she set as the lowest passing grade?
Using the p- value approach, test the hypotheses at the 5% level of significance.
It does not matter, when data are skewed mean and median are the same.
The NAEP test was also given to a sample of 1077 women of ages 21 to 25 years. Their mean quantitative score was 275. Take it as known that the standard deviation of all individual scores is = 60.
How large sample should be selected in order to obtain p estimate with a bound of 0.08 on the error of estimation.
What are the assumptions underlying a normal distribution? What are the assumptions underlying a binomial distribution? Why do we want to assume that our sample data represent a population distribution?
A snack company distributes chips in bags labeled 6 ounces. The local Bureau of Weights and Measures randomly selects 50 bags of chips and obtains a sample mean of 5.9 ounces.
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
Choice of exponential smoothing constant w has little or no effect on forecast values using exponential smoothing.
A neuropsychologist compare the auditory abilities of blind versus normally sighted rats. He predicted that the visually impaired rats would have better auditory development than normally sighted rats.
In a sample of 10 workers, what is the probability that exactly three workers take the public transport daily? [Hint: It is a Binomial Distribution Problem.]
Determine pearsons correlation coefficient and comment on the value obtained. Obtain a regression equation representing the above data. Estimate the production batch size for a direct labour cost of R350-00.
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