unit 2 review questions

Question 1

Alpha = 0.10 - which of the following is true? If we are doing 1 tail or 2 tail test (RTN or FTRN)

Answer 1

1 tail - FTRN
2 tail - FTRN

Question 2

The bull and alternative hypothesis are - Ho mew model = mew scr job.. H1 mew econ =/= mew scr job
(true or false)

Answer 2

False
Mew d = 0

Question 3

The test should not have been run because the sample sizes are not equal

Answer 3

False

Question 4

The above test compared mom and dad had influence on my major. 2 tail. Based on data there is no difference?

Answer 4

true

Question 5

Mean responses from test. Based on results females consider disparity more than males

Answer 5

True
The mean

Question 6

CLT works even if population shaped like disneyland ride

Answer 6

True
CLT shape of pop can be whatever

Question 7

When creating confidence intervals or running 1 sample hypothesis test which variable above is the random variable as represented by the letter

Answer 7

Z formula
Letter A which is x bar
s/square root of n = sample error

Question 8

If we are creating confidence interval fro a sample mean froma sample size of 10 with a 95 percent CL the t value would be

Answer 8

T= z = 1.96= is not t value
B = Z > 1.96
Z value should be greater than t value
Bigger critical value wider interval

Question 9

Students created two 95% CI intervals. Noticing there is no overlap the students believe that at least one of the confidence will not contain the population mean

Answer 9

True
At least one interval will not have population mean

Question 10

Students created two 95% CI intervals it is much more likely than not the the two samples come from same population

Answer 10

True
More overlap than not overlap

Question 11

Students created two 99% CI and the sample size for both is 70. The student stated
1. The samples come from different populations and
2. Population b is associated with top CI had less variation that pop A.
which is true

Answer 11

Both parts

Question 12

Created two 90% CL intervals. Both samples come from the same population, one CI does not contain mu due to chance. Is this correct?

Answer 12

Mew cannot be in both
True

Question 13

Confidence intervals were created, regarding the number of n=units taken by the students in current semester. Which model would have wider confidence intervals

Answer 13

Model A
99% larger is wider

Question 14

With a 95% confidence interval we are 95% confident that the pop means falls between lower and upper boundary

Answer 14

false

Question 15

What distribution will normally distribution under the CLT

Answer 15

The sampling distribution of the means

Question 16

Of the following choice which group has the least dispersion in employment in the dataset

Answer 16

Shortest interval
Construction

Question 17

insurance question… in the above statement I surveyed drivers who switched to ameriprise asking how much they saved… true or false the null and alternative are
Ho Mew = 532
H1 Mew > 532

Answer 17

true

Question 18

Researchers survey female HS students. On daily caloric intake. Divide them into two groups. In running a hypothesis test to best analyze the data, researcher should perform a

Answer 18

2 independent samples test for the means
Not dependent because what they eat is not dependent on others
Soccer team = independent
twins/siblings = dependent…

Question 19

Based on the test result, the person doing the test is in jeopardy of making a: crit value, rest stat = reject

Answer 19

Type 1

Question 20

Investing in a burger franchise. Avg franchise grosses 120K. We want more than that.
H0 mew = 120K
H1 mew > 120K
If we get any number greater than 120K we reject the null

Answer 20

false

Question 21

Lenon preganent if she is they will remodel a room. If lenon isnt then theyll donate.
The null and alternative
Null = lenon not pregant
Alt = lenon pregnant

Answer 21

true

Question 22

Students ran 2 HTs a Z test and t test. Did students choose the correct test for both sets of data

Answer 22

Sample sizes are both 30
No.. both should be Z
T test is less than 30 for sample size

Question 23

For a 2 independent sample test for the means, what term represent the chance

Answer 23

S (x bar 1 - x bar 2)
TS formula

Question 24

Two 2 sample hypothesis test are run. First test compares 1 and 2 vs 3 and 4

Answer 24

Test involving samples 1 and 2
From notes
Which has more in common? They will be equal

Question 25

As p value moves from centerline towards the tail of a distribution the p value _ in value

Answer 25

Decreases Think of a bell graph and how it thins out by the tail

Question 26

Two paired difference hypothesis tests were run. What is the primary reason that explains the difference in the test result. The top is FTRN. the bottom is RTN

Answer 26

Not the alpha or the mean It is the n (sample population) n and S are in denominator so they impact this

Question 27

For the rest on the left, student ran a two tail test (a = 0.05) the p-value of 0.0021 is directly associated with what value

Answer 27

0.05 or 1.2 None of the above t stat T = 3.1 P value less than alpha = RTN becasse p value further out on tail

Question 28

Student runs 2-sample test. Compares confidence in MIS 301 students. Female vs males. Student RTN because males are more confidence. Student concludes (solution for networking abilities)

Answer 28

false

Question 29

USGA has a rule equipment shall not cover an avg distance exceed in 280 years. Falloway is test golf ball A. the process sis control mew = 280. You calculate this: N = 36 X bar = 278.5 S = 12 A = 0.05

Answer 29

A. Ho mew = 280 H1 mew =/= 280 The market vs the rule is right in the middle. 280 yards. Tighten variation. Cannot exceed 280 (Z or T doesn't factor in this) Nobody buys the ball cuz the market