Construct and interpret a 95% confidence interval for the mean age at which a baby first crawls. (round to one decimal place as needed.)
a. the lower bound is 33.1 weeks and the upper bound is 45.4 weeks. we are 95% confident that the mean age at which a baby first crawls is within the confidence interval.
b. the lower bound is 33.11 weeks and the upper bound is 45.39 weeks. we are 95% confident that the mean age at which a baby first crawls is outside of the confidence

3382-299=3383- ? fill in the blank?

Christine wong has asked dave and mike to her move into a new apartment on sunday morning. she has asked them both, in case one of them does not show up. from past experience, christine knows that there is a 40% chance that dave will not show up and a 30% chance that mik a. what is the probability that both dave and mike will show up? (round your answer to 2 decimal places.) b. what is the probability that at least one of them will show up? c. what is the probability that neither dave nor mike will show up? (round your answer to 2 decimal places.)e will not show up. dave and mike do not know each other and their decisions can be assumed to be independent.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236