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A RANDOM sample,mean=83 and n=625 assume standard deviation =15.
a) test null hypothesis: Meu=80 against alternative hpothesis=negative = 80 (alpha =.05). What does this tell you about meu?
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
Is there evidence of a difference in objection to sharing information among the organizational groupings? (use α = 0.05)
How many individuals will it need to sample to achieve this level of accuracy and confidence?
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes.
Do the above values appear to be in statistical control, justify your answer?
A production process is known to produce a particular item in such a way that 5 percent of these are defective. If two items are randomly selected as they come off the production line
Assume that 60 percent of the voters in a particular region support a candidate. Find the probability that a sample of 1,000 voters will yield a sample proportion in favor of the candidate within 4 percentage points of the actual proportion.
To find the probability values in case of raw data, binomial, normal
You are the principal of a large urban high school and wish to do a parent survey to determine how parents feel about same-sex classes.
Let Y be the number of envelopes for which the machine fails to remove a check. Using the Central Limit Theorem to approximate P{Y≤10}.
What different types of variables are used in quantitative studies? Describe each type of variable and how they differ.
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