A major agricultural company is testing a newvariety of wheat to determine whether it is more resistant tocertain insects than is the current wheat variety. The pro-portion of a current wheat crop lost to insects is . Thus,the company wishes to test the following hypotheses:
Which of the following significance levels and sample sizes
would lead to the highest power for this test?
we have been given five options from which one is correct and the correct is (e)
While it is possible to derive the power of a given function
Which of the following statements about the t distribution with degrees of freedom df is (are) true?
I. It is symmetric.
II. It has more variability than the t distribution with degrees of freedom.
III. As df increases, the t distribution approaches the standard Normal distribution.
(a) I only (c) III only (e) I, II, and III
(b) II only (d) I and II
Which sampling method was used in each of the following settings, in order from I to IV?
I. A student chooses for a survey the first students to arrive at school.
II. The name of each student in a school is written on a card, the cards are well mixed, and names are drawn.
III. A state agency randomly selects people from each of the state’s senatorial districts.
IV. A city council randomly selects eight city blocks and then surveys all the voting-age residents of those blocks.
(a) Voluntary response, SRS, cluster, stratified
(b) Voluntary response, SRS, stratified, cluster
(c) Convenience, cluster, SRS, stratified
(d) Convenience, SRS, cluster, stratified
(e) Cluster, SRS, stratified, convenience
Some high school physics students dropped a ball and measured the distance fallen (in centimeters) at various times (in seconds) after its release. If you have studied physics, then you probably know that the theoretical relationship between the variables is distance . A scatterplot of the students’ data showed a clear curved pattern. At seconds after release, the ball had fallen centimeters. How much more or less did the ball fall than the theoretical model predicts?
(a) More by centimeters
(b) More by centimeters
(c) No more and no less
(d) Less by centimeters
(e) Less by centimeters
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