# Stats Final Test Questions Lily Taylor
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Following a dramatic drop of 500 points

a. Statistic
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What distribution of values taken by a statistic in all possible samples of the same size…

d. the sampling distribution of the statistic
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If a statistic used to estimate a parameter is such that the mean is … true value…

d. unbiased
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In order to use the formula to calculate the standard deviation

c. III Only
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The central limit theorem refers to which ..

a. Regardless of the shape of the population’s distribution, it will be approx normal
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A simple random sample of 1000 Americans found that 62% were satisfied with the service…

a. exactly the same
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A student investigating study habits…

e. shape of the distribution is unknown
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In a large population 46% of the households own DVD recorders…

e.
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Olive weights are classified

a.
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suppose you take a random sample of size 25…

C. The sampling distribution of the sample mean
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In an opinion poll, 25% of a random sample of 200..

B. 0.0306
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A marketing consultant wants to estimate the proportion of all shoppers…

D. The data is a random sample from the population of interest
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the report of a sample survey of 1014 adults says with 95% confidence ..

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
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The survey in the previous question was conducted by calling land line telephones..

E. throw this out and start over again with a better sampling
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some scientists believe that a new drug would benefit…

B. 1068
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A nation wide poll of 2,525 adults estimated .. support health care…

c. it would be larger because higher confidence requires a larger margin of error
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which of the following has the highest probability

D. Randomly selecting a value less than 3 from a standard normal distribution
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you want to calculate a 98% cI with a population mean of sample n= 18

E. 2.567
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the heights of males in the us are normal distributed if..

c. 0.83
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in checking conditions for constructing confidence intervals for a pop..

B. sample Y only
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In a test of Ho: p= 0.7

c. 0.4238
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A. Ho: p=5 Ha: p> 0.5
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In a test of Ho u = 100 p value – 0.08

D. There is insufficient evidence to conclude that U does not equal 100
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Which of the following is not a required condition for preforming a t test ?

b. the population standard deviation is known
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an appropriate 95% cI for u has been calculated as ( -0.73, 1.92)

b. fail to reject Ho at the a = 0.05 level of sig
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which of the following increases the power of a sig test

d. increasing sig level
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the infamous psychologist dr. vise grips….

d. only the distribution of differences must be normal
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bags of a certain brant of tortilla chips claim to …

a. concluding that the bags are being under filled when they actually aren’t
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a medical researcher is working on a new treatment for cancer…

e. she should expand her research program to include more subjects – this was a small sample
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you are testing the hypothesis that a new method for freezing green beans..

e. the probability of concluding that the true mean is higher than 12 mg/ serving when it is actually 13.5 per serving
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a city planner is comparing traffic patters at 2 diff intersections..

c. matched pairs test
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we wish to test if the two varieties are significantly different in their mean

C. Ho: u1 = u2 ha u1 doesn’t = u2
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assuming the conditions for inference were met which is most appropriate?

E. We cannot reject Ho. We do not have evidence to show carbs are different
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Popular wisdom is eating cereal

B.
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you are constructing a 90% ci for the difference of means from srs

E – t procedures are not recommended in any of these cases
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when calculating the test statistic ( janice and linda)

C. square root
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Janice and Linda test statistic

E. 0.2846
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Janice and Linda Type 1

A. Concluding that there is a difference is rainy days when there is not
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Gum – null hypothesis

C. flavor preferences are evenly distributed
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Gum – conditions

B. II and III only
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Gum – component of chi – square statistic winter green

E.
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colors – null

A. distribution is the same
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colors – expected count

C. 77.102 / 214
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colors – chi square

E. P value > 0.01
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traffic – chi df

C. 6
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traffic – individual components

B. there are many more light trucks on Rout 9 than we would expect
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D. II and III
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accident rate for some car colors different that for other…

D. Fail to reject ho :there is insufficient evidence to establish an association
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Heights – which of the following is the estimate of the standard deviation

A. 1.333
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which of the following is the best interpretation of the quantity s= 14.16

B. prediction of weight from height based on this regression model will be off by about 14 pounds
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if a student uses these data to test the hypothesis Ho b = 0 …

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
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its easy to measure the circumference of a tree’s trunk..

A. 93′
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A residual plit is useful because..

C. I and II only
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Which of the following is NOT a goal of re- expressing data?

E. all of the above are goals
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The mode distance = 3.30 +. 235 (speed) can be used to predict the stopping distance ..

D. 345 feet
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Over the past decade a farmer had been able to increase his wheat production..