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The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years. Assume the population of consumer ages is normally distributed.
a. Using the confidence interval method, test the claim that the average age of consumers is at least 30 years ( α= 0.05).b. Test the same claim by using the test statistics method ( Z or T test).c. Test the same claim by using the P-Value method ( Z or T test).
A marketing survey is taken among fast food customers to determine their preference for hot dogs or pizza. Of the 200 respondents selected,
A study suggested that personality type is related to heart disease. Specifically, type A people,who are competitive, driven, pressured, and impatient, are more prone to heart disease.
Write the claim mathematically and identify H0 and Ha (b)Find the critical value(s) and identify the rejection region(s). (c) Find the standardized test statistic.
Find the value of k. Find the cdf of X. Find the mean and the variance of X.
The the steps of hypothesis testing b) sketch the distribution involved, and c) explain your answer to someone who is familiar with the t test for a single sample but not with the t sest for independent means.
In Gallup polls taken at different times, subjects were asked if they owned a gun, and the number of yes responses was recorded for each time period. Is this discrete or continuous? why?
Suppose you toss ten coins and count the number of heads. What is the probability that the number of heads you count will lie within two standard deviations of the mean?
Past data reveals that the graduation rate was 72% for the medical school at a university. If 10 medical students are randomly selected for that school. Find the probability that only 4 of them will graduate.
In the belief that Statistics is too hard, a student claims that the mean score on a final exam is less then 70. 15 scores will be chosen at random to test this claim.
If a new graduate is given a bunch of flowers from this outlet, what is the probability that the flowers were purchased by their partner or friend?
From this data set, compute the sample mean, median, mode and midrange. Compute the 1st quartile and 3rd and interpret their meanings.
Find ten consecutive composite numbers. Find the prime factors of 1147 and of 1716. Are there any common factors?
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