Emma Sibley
6,8,14,16,22,26,28
6.
a. null hypothesis
b. Alternative hypothesis
8.
a. The results are rare
b. We want to study relationships and we believe that we've found one only when it is
significant.
c. The final step is to understand and interpret the relationship.
14.
a. This study aims to determine whether college students consume more pizza during the final
week of a semester than during the rest of the semester.
The hypothesis is a one-sided test.
b. This study aims to determine whether breathing exercises a
ff
ect blood pressure.
The hypothesis is a two-sided test.
c. This study aims to determine whether the increased hormone
levels a
ff
ect pain sensitivity.
The one-sided hypothesis test.
d. This study aims to determine whether the frequency of daydreaming decreases with more
light in the room.
The hypothesis is one sided test.
16.
a. From the information, the researcher is interested to test the national mean for a student in
public school is equal to 75.62 or not. Therefore, the alternative hypothesis is two tail test.
b.
c. -1.54
d. From the given information, the level of significance is 0.05 and the type of test is two tail
test. From the table, the critical value corresponding with 0.05 level and two tail test are -1.96 and
1.96.
e. The test statistic value is -1.54 and the critical values are -1.96 and 1.96.
The test statistic value is less than the positive critical value and the test statistic value is less than
the negative critical value.
Therefore, by the rejection rule, null hypothesis is not rejected.
It can be concluded that the national mean for a student in public school is equal to 75.62.
22.
As the researcher A finds a significant relationship between the variables increasing stress level and
ability to concentrate, then it can be said that researcher A made a type I error in the study. As the
researcher B finds a nonsignificant relationship between the variables increasing stress level and