Sophia Intro To Statistics Prob & Stats Unit 5 Milestone 5
Hypothesis Testing & Confidence Intervals Questions And
Answers Latest Solutions
, UNIT 5 — MILESTONE 5
RETAKE
20/23 that's 87%
A superintendent of a school district conducted a survey to find out the
level of job satisfaction among teachers. Out of 53 teachers who replied to
the survey, 13 claim they are satisfied with their job.
The superintendent wishes to construct a significance test for her data.
She finds that the proportion of satisfied teachers nationally is 18.4%.
What is the z-statistic for this data? Answer choices are rounded to the
hundredths place.
1.24
●
0.61
●
1.15
, lOMoAR cPSD| 7670600
2.90
●
RATIONALE
To make things a little easier, let's first note the denominator
Finally, subbing all in we find
CONCEPT
→ Z-Test for Population Proportions
Report an issue with this question
2 ●
The government claims that the average age of Californians is 34 years. Joe
hypothesizes that the average age of the population of California is not
equal to 34 years. He records a sample mean equal to 37 and states the
hypothesis as μ = 34 vs μ ≠ 34.
What type of test should Joe do?
Two-tailed test
Right-tailed test
●
, Left-tailed test
●
Joe should not do any of the types ●
of tests listed.
RATIONALE
Since the Hₐ is a not equal (≠) sign, this indicates he wants to run a two-
tailed test where the rejection region is the upper or lower tail.
CONCEPT
→ One-Tailed and Two-Tailed Tests
Report an issue with this question
3 ●
Rachel recorded the number of calls she made at work during the week:
Day Calls
Monday 18
Tuesday 14
Wednesday 24
Thursday 16
She expected to make 18 calls each day. To answer whether the number of
calls follows a uniform distribution, a chi-square test for goodness of fit
should be performed. (alpha = 0.10)
What is the chi-squared test statistic? Answers are rounded to the nearest
hundredth.
3.11
Hypothesis Testing & Confidence Intervals Questions And
Answers Latest Solutions
, UNIT 5 — MILESTONE 5
RETAKE
20/23 that's 87%
A superintendent of a school district conducted a survey to find out the
level of job satisfaction among teachers. Out of 53 teachers who replied to
the survey, 13 claim they are satisfied with their job.
The superintendent wishes to construct a significance test for her data.
She finds that the proportion of satisfied teachers nationally is 18.4%.
What is the z-statistic for this data? Answer choices are rounded to the
hundredths place.
1.24
●
0.61
●
1.15
, lOMoAR cPSD| 7670600
2.90
●
RATIONALE
To make things a little easier, let's first note the denominator
Finally, subbing all in we find
CONCEPT
→ Z-Test for Population Proportions
Report an issue with this question
2 ●
The government claims that the average age of Californians is 34 years. Joe
hypothesizes that the average age of the population of California is not
equal to 34 years. He records a sample mean equal to 37 and states the
hypothesis as μ = 34 vs μ ≠ 34.
What type of test should Joe do?
Two-tailed test
Right-tailed test
●
, Left-tailed test
●
Joe should not do any of the types ●
of tests listed.
RATIONALE
Since the Hₐ is a not equal (≠) sign, this indicates he wants to run a two-
tailed test where the rejection region is the upper or lower tail.
CONCEPT
→ One-Tailed and Two-Tailed Tests
Report an issue with this question
3 ●
Rachel recorded the number of calls she made at work during the week:
Day Calls
Monday 18
Tuesday 14
Wednesday 24
Thursday 16
She expected to make 18 calls each day. To answer whether the number of
calls follows a uniform distribution, a chi-square test for goodness of fit
should be performed. (alpha = 0.10)
What is the chi-squared test statistic? Answers are rounded to the nearest
hundredth.
3.11
