Select the statements that are true of the least-squares regression model.

a. is based on sample data
b. predicts the mean response for each value of the explanatory variable x
c. is defined in terms of two population parameters representing the slope and intercept
d. features known parameters representing the slope and intercept
e. assumes that the mean response has a straight-line relationship with the explanatory variable x

The triangles are similar. what is the value of x? show your work.

Which data set has a greater spread? why? set a: {38, 12, 23, 48, 55, 16, 18} set b: {44, 13, 24, 12, 56} has a greater spread because .

Now 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.