unit 2 review questions Flashcards
Alpha = 0.10 - which of the following is true? If we are doing 1 tail or 2 tail test (RTN or FTRN)
1 tail - FTRN
2 tail - FTRN
The bull and alternative hypothesis are - Ho mew model = mew scr job.. H1 mew econ =/= mew scr job
(true or false)
False
Mew d = 0
The test should not have been run because the sample sizes are not equal
False
The above test compared mom and dad had influence on my major. 2 tail. Based on data there is no difference?
true
Mean responses from test. Based on results females consider disparity more than males
True
The mean
CLT works even if population shaped like disneyland ride
True
CLT shape of pop can be whatever
When creating confidence intervals or running 1 sample hypothesis test which variable above is the random variable as represented by the letter
Z formula
Letter A which is x bar
s/square root of n = sample error
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
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
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
True
At least one interval will not have population mean
Students created two 95% CI intervals it is much more likely than not the the two samples come from same population
True
More overlap than not overlap
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
Both parts
Created two 90% CL intervals. Both samples come from the same population, one CI does not contain mu due to chance. Is this correct?
Mew cannot be in both
True
Confidence intervals were created, regarding the number of n=units taken by the students in current semester. Which model would have wider confidence intervals
Model A
99% larger is wider
With a 95% confidence interval we are 95% confident that the pop means falls between lower and upper boundary
false
What distribution will normally distribution under the CLT
The sampling distribution of the means
Of the following choice which group has the least dispersion in employment in the dataset
Shortest interval
Construction
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
true
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
2 independent samples test for the means
Not dependent because what they eat is not dependent on others
Soccer team = independent
twins/siblings = dependent…
Based on the test result, the person doing the test is in jeopardy of making a: crit value, rest stat = reject
Type 1
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
false
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
true
Students ran 2 HTs a Z test and t test. Did students choose the correct test for both sets of data
Sample sizes are both 30
No.. both should be Z
T test is less than 30 for sample size
For a 2 independent sample test for the means, what term represent the chance
S (x bar 1 - x bar 2)
TS formula
Two 2 sample hypothesis test are run. First test compares 1 and 2 vs 3 and 4
Test involving samples 1 and 2
From notes
Which has more in common? They will be equal
As p value moves from centerline towards the tail of a distribution the p value _ in value
Decreases
Think of a bell graph and how it thins out by the tail
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
Not the alpha or the mean
It is the n (sample population)
n and S are in denominator so they impact this
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
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
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)
false
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
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
