Steve's average golf score at his local course is 92.9 from a random sample of 60 rounds of golf. Assume that the population standard deviation for his golf score is 4.2. The standard error of the mean for this sample is ________. A)  0.54 B)  1.17 C)  1.56 D)  2.30

As shown below are two normal curves. Let and o be the mean and the standard deviation of curve A (the more peaked curve) and Hg and og be the mean and the standard deviation of curve B (the broader curve). What do you observe about these two normal curves? P(x) 0.4 A 0.3 0.2 0.1 0.0 2 4 6 10 2 14 Select one: a. All statements are true. b. The mean of both curves is 8. Symbolically, HA = HB = 8. c. Both curves are symmetric with respect to their means. O d. Curve A has a lower standard deviation than Curve B. Symbolically, oA 8.

Calculate the standard deviation from the following data: Heights in cm 150 155 160 165 170 175 180 No. of students 15 24 32 33 24 16 6 [Ans.: 8.038 cm]

In the US, 43.9% of all people have type O blood, 40.6% have type A blood, 10.8% have type B blood and 4.7% have type AB blood. A researcher wants to see if the distribution of blood type is different for millionaires. The table below shows the results of a random sample of 3488 millionaires. What can be concluded at the a = 0.05 significance level? a. Complete the table by filling in the expected frequencies. Round to the nearest whole number: Frequencies of Blood Type Outcome Frequency Expected Frequency 1521 A 1427 В 376 АВ 164