Problem 4E

Let X equal the weight of the soap in a “6-pound” box. Assume that the distribution of X is N(6.05, 0.0004).

(a) Find P(X < 6.0171).

(b) If nine boxes of soap are selected at random from the production line, find the probability that at most two boxes weigh less than 6.0171 pounds each. Hint: Let Y equal the number of boxes that weigh less than 6.0171 pounds.

(c) Let ≤ 6.035).

Psych 2300: Psychology Research Methods 6/15 & 6/17 Four Validities - Validity: appropriateness of a conclusion or decision Construct Validity Operationalization of a variable Applies to all claims Is this a reasonable way of quantifying what I want to understand Assessing creativity measure x : is x a reasonable way to measure creativity External Validity Generalizability o How was the sample gathered o Can I apply this elsewhere Can these results extend beyond my study Can I apply it to the population I am interested in Who can I apply these results to Representativeness How representative is your sample of the population of interest Specifically interested