A recent study used umbilical cord blood to test for 25 hydroxyvitamin D,which is an indicator of vitamin D status of the baby.It was reported that 65% of babies tested were deficient in vitamin D in spite of the fact that the mothers consumed vitamin D supplements during pregnancy.A researcher in a northern region felt that this percentage was too high for this region because with the reduced hours of sunshine during winter months,pregnant women tended to use higher doses of supplements to compensate.A sample of 125 newborns was tested,and 72 were declared to be deficient in vitamin D.What is the P-value and the conclusion using  = 0.05?

A) P = 0.042;do not reject H₀ since the P-value is less than the given  level.
B) P = 0.047;do not reject H₀ because it is significant at the given  level.
C) P = 0.084;the result is not significant at the  = 0.05 level.
D) P = 0.041;reject H₀ since the P-value is less than the given  level.
E) We are unable to calculate the P-value or reach a conclusion with the information given.

George calculates the F-ratio for a one-way ANOVA comparing the means of three groups: Group A (M = 4.12) , Group B (M = 7.37) and Group C (M = 8.92) . If he makes the decision to reject the null hypothesis, what is the most specific and appropriate conclusion he can make?

A) The groups are all different from each other.
B) The groups are not all equal to each other.
C) Group A ≠ Group B ≠ Group C
D) Group A < Group B < Group C

The primary tool for determining whether the assumptions made about the regression model are appropriate is

A) ​interval estimation.
B) ​significance testing.
C) ​least squares regression.
D) ​residual analysis.

A textile company is interested in knowing if there is a difference in the breaking strength of four different kinds of thread. Test whether there is a significant difference in mean breaking strength of the four kinds of thread. Calculate the test statistic.
F = ______________
Set up the rejection region for = 0.05.
The rejection region is ______________.
What conclusion can be drawn?
______________
______________ of the mean breaking strengths of the four kinds of threads is significantly different from the others.
Find the approximate p-value.
CI = ______________ Enter (n1, n2)
Find a 90% confidence interval for .
CI = ______________ Enter (n1, n2)

Construct validity is the most difficult of all the validities to establish.

What is the horizontal axis on a graph called?

A) x-axis
B) y-axis
C) z-axis
D) frequency axis