The service manager of a car dealer wants to determine if owners of new cars (A) tune up their cars more frequently than owners of older cars (B). From his records he takes a random sample of ten new cars and ten older cars and determines the number of times the cars were tuned up in the last 12 months. The data are given in Tune ups. xlsx . They want to determine if new car owners (A) tune up their cars more frequently than older car owners (B). What is the rejection region at 10% significance level?

Aline that intersects one of two parallel lines intersects the other also always sometimes never

Max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

Math i have no idea how to do a and b