Stats
posted by Jennifer on .
A sample of 27 blue M&Ms has a mean weight of 0.8560 grams. Assume that is known to be 0.0565 g. Consider a hypothesis test that uses a 0.05 significance level to test the claim that the mean weight of all M&Ms is equal to 0.8535 grams (the weight necessary so that bags of M&Ms have the weight printed on the package).
a)What is the test statistic?
b)What is the critical value.
c)What is the Pvalue?
d)What is the conclusion about the null hypothesis (reject, fail to reject)?
e)Give the final conclusion in simple nontechnical terms.

To get P = .05, Ho needs to have μ ± 1.96 SD, Reject Ho, if value is outside that range.
P is determined by Z score = (Xμ)/SD. Look up value in "area under normal distribution" in back of your stats text.
Is "that" your SD?
I hope this helps. If not, repost with more questions. Thanks for asking.