Suppose two samples are taken. Sample 1 has a mean of 105 and a standard deviation of 15 and sample two has a mean of 100 and a standard deviation of 22. Assume the samples are taken on the same scale/variable.
Which of the following is a correct statement about these samples?

a. Sample 2 has more variability than sample 1.
b. Both samples are more or less the same.
c. Sample 1 has more variability than sample 2.
d. The mean of sample 2 is significantly higher than the mean of sample 1.

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.