Quiz 6 Flashcards
(30 cards)
A one tailed test is
a. hypothesis test in which rejection regions is in both tails of the sampling distributuion
b. hypothesis test in which rejection region is only in the upper tail of the sampling dsitribution
c. hypothesis test in which rejection region is in one tail of the sampling distribtuion
d hypothesis test in which rejection region is only in the lower tail of the sampling distribution
Hypothesis test in which rejection region is in one tail of the sampling distribution
A p-value is the
a. probability, when the null hypothesis is true, of obtaining a sample result that is at least as unlikely as what is observed
b. probability corresponding to the crtitical value(s) in a hypothesis test
c. value of the test statistc
d. probability of a type s error
probability, when the null hypothesis is true, of obtaining a sample result that is at least unlikely as what is observed
A two tailed test is a
a. Hypothesis test in which rejection rejoin is only in the lower tail of the sampling distribution
b. Hypothesis test in which rejection rejoin is in one tail of the sampling distribution
c. Hypothesis test in which rejection rejoin is in the upper tail of the sampling distribtuion
d. Hypothesis test in which rejection rejoin is in both tails of the sampling distribution
both tails of the sampling distribution
A type 1 erros is committed when
a. a true null hypothesis is rejected
b. the critical value is greater than the value of the test statistic
c. a true alternative hypothesis is not accepted
d. sample sata contradict the null hypothesis
A true null hypothesis is rejected
A type 2 error is committed when
a. a true alternative hypothesis is mistakenly rejected
b. the sample size has been too small
c. a true null hypothesis is mistakenly rejected
d. not enough information has been available
a true alternative hypothesis is mistakenly rejected
As a general guideline, the research hypothesis should be stated as the
a. hypothesis the researcher wants to disprove
b. alternative hypothesis
c. tentative assumption
d. null hypothesis
alternative hypothesis
Excels _________ funciton can be used to calculate a p-value for a hypothesis test when o is unknown
a. NORM.S.DIST
b. Not enough information is given to answer this question
c. T.DIST
d. RAND
T.DIST
n = 36 h0: u<20
x-bar = 24.6 Ha: u >20
o=12
The test statistic equals
a. -0.38
b. 0.38
c. -2.3
d. 2.3
2.3
n = 36 h0: u<20
x-bar = 24.6 Ha: u >20
o=12
If the rest is done at a .05 level of significance, the null hypothesis should
a. Not enough information is given to asnwer this question
b. None of the other answers are correct
c. not be rejected
d. be rejected
Be rejected
n = 15
X-Bar = 75.607 Ho: u > 80
s = 8.246. Ha: u < 80
Assume population is normally distributed
The p-value is equal to
a. 0.0166
b. 0.0250
c. 0.0332
d. -0.0166
0.0250
A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%.
At a .05 level of significance, it can be concluded that the proportion of the population in favor of candidate A is
a. significantly greater than 80%
b. significantly greater than 75%
c. not significantly greater than 75%
d. not significantly greater than 80%
Significantly greater than 75%
For a two-tailed test with a sample size of 40, the null hypothesis will NOT be rejected at a 5% level of significance if the test statistic is
a. between -1.96 and 1.96, exclusively
b. greater than -1.645
c. greater than 1.96
d. less than 1.645
Between -1.96 and 1.96 exclusively
If a hypothesis is not rejected at a 5% level of significance, it will
a. Not enough information is is given to answer this question
b. always be rejected at the 1% level
c. sometimes be rejected at the 1% level
d. also not be rejected at the 1% level
Also NOT be rejected at the 1% level
If a hypothesis is rejected at a 5% level significance, it
a. will always be rejected at the 1% level
b. will never be rejected at the 1%
c. may be rejected or not rejected at the 1% level
d. will always be accepted at the 1% level
may be rejected or not rejected at the 1% level
In hypothesis testing if the null hypothesis has been rejected when the alternative hypothesis has been true
a. the correct decision has been made
b. a Type 2 error has been committed
c. either a Type 1 or Type 2 error has been committed
d. A Type 1 error has been committed
the correct decision has been made
In hypothesis testing, the alternative hypothesis is
a. the hypothesis tentatively assumed true in the hypothesis-testing procedure
b. the hypothesis concluded to be true of the null hypothesis is rejected
c. All of the answers are correct
d. the maximum probability of type 1 error
the hypothesis concluded to be true if the null hypothesis is rejected
In hypothesis, the critical value is
a. the probability of a type 1 error
b. a number that establishes the boundary of the rejection region
c. the probability of a type 2 error
d. the same as the p-value
A number that establishes the boundary of the rejection region
In the hypothesis testing procedure, alpha is
a. the critical value
b. 1- level of significance
c. the confidence level
d. the level of significance
the level of significance
In the past, 75% of the tourists who visited Chattanooga went to see Rock City. The mangagement of Rock City recently undertook an extensive promotional campaign. They are interested in determining whenther the promotional campaign actually INCREASED the proportion of tourists visting visting Rock City. The correct set of hypothesis is
a. H0: p > 0.75 Ha: p <(less than or equal to) 0.75
b. H0: p <(less than or equal to) 0.75 Ha: p > 0.75
c. H0: p > (greater or equal to) 0.75 Ha: p < 0.75
d. H0: p < 0.75 Ha: p >(greater or equal to) 0.75
Ho: p <(less than or equal to) 0.75 Ha: p > 0.75
Read the t statistic from the table of t distriutions and circle the correct answer. A one-tailed test (upper tail), a sample size of 18 at a 0.05 level of significance t =
a. 1.734
b. 1.740
c. 2.12
d. -1.740
1.740
Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (lower tail) at a 0.63 level of signifiance; z =
a. -1.53
b. -1.645
c. -1.96
d. -1.86
-1.53
The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles. Management believes that due to a new production process, the life expectancy of its tires has increased. In order to test the validity of this belief, the correct set of hypotheses is
a. H0: u > 40,000 Ha: u <(less or equal to) 40,000
b. H0: u < 40,000 Ha: u > (greater or equal) 40,000
c. H0: u >(greater or equal to) 40,000 Ha: u < 40,000
d. H0: u <(less or equal) 40,000 Ha: u > 40,000
Ho: u < (less than or equal to) 40,000 Ha: u > 40,000
The schools newspaper reported that the proprtion of students majoring in business is at least 30%. You plan on taking a sample to test the newspaper claim. The correct set of hypotheses is
a. H0: p <(less or equal to) 0.30 Ha: p > 0.30
b. H0: p > 0.30 Ha: P <(less or equal) 0.30
c. H0: p < 0.30 Ha: p (greater or equal to) 0.30
d. H0: p(greater or equal) 0.30 Ha: p < 0.30
Ho: p (greater or equal to) 0.30 Ha: p < 0.30
Two approaches to drawing a conclusion in a hypothesis test are
a. one tailed and two tailed
b. null and alternative
c. Type 1 and Type 2
d. p-value and critical value
p-value and critical value
