Stats Final Test Questions – Flashcards
Unlock all answers in this set
Unlock answersquestion
Following a dramatic drop of 500 points
answer
a. Statistic
question
What distribution of values taken by a statistic in all possible samples of the same size...
answer
d. the sampling distribution of the statistic
question
If a statistic used to estimate a parameter is such that the mean is ... true value...
answer
d. unbiased
question
In order to use the formula to calculate the standard deviation
answer
c. III Only
question
The central limit theorem refers to which ..
answer
a. Regardless of the shape of the population's distribution, it will be approx normal
question
A simple random sample of 1000 Americans found that 62% were satisfied with the service...
answer
a. exactly the same
question
A student investigating study habits...
answer
e. shape of the distribution is unknown
question
In a large population 46% of the households own DVD recorders...
answer
e.
question
Olive weights are classified
answer
a.
question
suppose you take a random sample of size 25...
answer
C. The sampling distribution of the sample mean
question
In an opinion poll, 25% of a random sample of 200..
answer
B. 0.0306
question
A marketing consultant wants to estimate the proportion of all shoppers...
answer
D. The data is a random sample from the population of interest
question
the report of a sample survey of 1014 adults says with 95% confidence ..
answer
D. the method used to get the interval from 9% to 15% when used over and over, produces intervals which include the true population percentage about 95% of time
question
The survey in the previous question was conducted by calling land line telephones..
answer
E. throw this out and start over again with a better sampling
question
some scientists believe that a new drug would benefit...
answer
B. 1068
question
A nation wide poll of 2,525 adults estimated .. support health care...
answer
c. it would be larger because higher confidence requires a larger margin of error
question
which of the following has the highest probability
answer
D. Randomly selecting a value less than 3 from a standard normal distribution
question
you want to calculate a 98% cI with a population mean of sample n= 18
answer
E. 2.567
question
the heights of males in the us are normal distributed if..
answer
c. 0.83
question
in checking conditions for constructing confidence intervals for a pop..
answer
B. sample Y only
question
In a test of Ho: p= 0.7
answer
c. 0.4238
question
an opinion poll asks an SRS of seniors about jobs
answer
A. Ho: p=5 Ha: p> 0.5
question
In a test of Ho u = 100 p value - 0.08
answer
D. There is insufficient evidence to conclude that U does not equal 100
question
Which of the following is not a required condition for preforming a t test ?
answer
b. the population standard deviation is known
question
an appropriate 95% cI for u has been calculated as ( -0.73, 1.92)
answer
b. fail to reject Ho at the a = 0.05 level of sig
question
which of the following increases the power of a sig test
answer
d. increasing sig level
question
the infamous psychologist dr. vise grips....
answer
d. only the distribution of differences must be normal
question
bags of a certain brant of tortilla chips claim to ...
answer
a. concluding that the bags are being under filled when they actually aren't
question
a medical researcher is working on a new treatment for cancer...
answer
e. she should expand her research program to include more subjects - this was a small sample
question
you are testing the hypothesis that a new method for freezing green beans..
answer
e. the probability of concluding that the true mean is higher than 12 mg/ serving when it is actually 13.5 per serving
question
a city planner is comparing traffic patters at 2 diff intersections..
answer
c. matched pairs test
question
we wish to test if the two varieties are significantly different in their mean
answer
C. Ho: u1 = u2 ha u1 doesn't = u2
question
assuming the conditions for inference were met which is most appropriate?
answer
E. We cannot reject Ho. We do not have evidence to show carbs are different
question
Popular wisdom is eating cereal
answer
B.
question
you are constructing a 90% ci for the difference of means from srs
answer
E - t procedures are not recommended in any of these cases
question
when calculating the test statistic ( janice and linda)
answer
C. square root
question
Janice and Linda test statistic
answer
E. 0.2846
question
Janice and Linda Type 1
answer
A. Concluding that there is a difference is rainy days when there is not
question
Gum - null hypothesis
answer
C. flavor preferences are evenly distributed
question
Gum - conditions
answer
B. II and III only
question
Gum - component of chi - square statistic winter green
answer
E.
question
colors - null
answer
A. distribution is the same
question
colors - expected count
answer
C. 77.102 / 214
question
colors - chi square
answer
E. P value > 0.01
question
traffic - chi df
answer
C. 6
question
traffic - individual components
answer
B. there are many more light trucks on Rout 9 than we would expect
question
what about chi is true
answer
D. II and III
question
accident rate for some car colors different that for other...
answer
D. Fail to reject ho :there is insufficient evidence to establish an association
question
Heights - which of the following is the estimate of the standard deviation
answer
A. 1.333
question
which of the following is the best interpretation of the quantity s= 14.16
answer
B. prediction of weight from height based on this regression model will be off by about 14 pounds
question
if a student uses these data to test the hypothesis Ho b = 0 ...
answer
C. since the p-value of .0008 is less than.. reject Ho. We have convincing evidence it is a linear relationship between height and weight
question
its easy to measure the circumference of a tree's trunk..
answer
A. 93'
question
A residual plit is useful because..
answer
C. I and II only
question
Which of the following is NOT a goal of re- expressing data?
answer
E. all of the above are goals
question
The mode distance = 3.30 +. 235 (speed) can be used to predict the stopping distance ..
answer
D. 345 feet
question
Over the past decade a farmer had been able to increase his wheat production..
answer
B. Linear
question
A Scatterplot of log(Y) vs. log(X) reveals
answer
D. residuals plot for regression of Y on X shoes a curved patter
