Stats Final Test Questions

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Following a dramatic drop of 500 points
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a. Statistic
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What distribution of values taken by a statistic in all possible samples of the same size…
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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…
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d. unbiased
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In order to use the formula to calculate the standard deviation
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c. III Only
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The central limit theorem refers to which ..
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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…
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a. exactly the same
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A student investigating study habits…
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e. shape of the distribution is unknown
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In a large population 46% of the households own DVD recorders…
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e.
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Olive weights are classified
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a.
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suppose you take a random sample of size 25…
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C. The sampling distribution of the sample mean
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In an opinion poll, 25% of a random sample of 200..
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B. 0.0306
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A marketing consultant wants to estimate the proportion of all shoppers…
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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 ..
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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..
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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…
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B. 1068
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A nation wide poll of 2,525 adults estimated .. support health care…
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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
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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
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E. 2.567
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the heights of males in the us are normal distributed if..
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c. 0.83
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in checking conditions for constructing confidence intervals for a pop..
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B. sample Y only
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In a test of Ho: p= 0.7
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c. 0.4238
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an opinion poll asks an SRS of seniors about jobs
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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
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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 ?
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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)
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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
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d. increasing sig level
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the infamous psychologist dr. vise grips….
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d. only the distribution of differences must be normal
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bags of a certain brant of tortilla chips claim to …
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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…
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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..
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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..
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c. matched pairs test
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we wish to test if the two varieties are significantly different in their mean
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C. Ho: u1 = u2 ha u1 doesn’t = u2
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assuming the conditions for inference were met which is most appropriate?
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E. We cannot reject Ho. We do not have evidence to show carbs are different
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Popular wisdom is eating cereal
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B.
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you are constructing a 90% ci for the difference of means from srs
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E – t procedures are not recommended in any of these cases
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when calculating the test statistic ( janice and linda)
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C. square root
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Janice and Linda test statistic
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E. 0.2846
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Janice and Linda Type 1
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A. Concluding that there is a difference is rainy days when there is not
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Gum – null hypothesis
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C. flavor preferences are evenly distributed
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Gum – conditions
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B. II and III only
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Gum – component of chi – square statistic winter green
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E.
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colors – null
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A. distribution is the same
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colors – expected count
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C. 77.102 / 214
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colors – chi square
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E. P value > 0.01
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traffic – chi df
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C. 6
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traffic – individual components
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B. there are many more light trucks on Rout 9 than we would expect
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what about chi is true
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D. II and III
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accident rate for some car colors different that for other…
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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
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A. 1.333
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which of the following is the best interpretation of the quantity s= 14.16
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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 …
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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..
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A. 93′
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A residual plit is useful because..
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C. I and II only
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Which of the following is NOT a goal of re- expressing data?
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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 ..
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D. 345 feet
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Over the past decade a farmer had been able to increase his wheat production..
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B. Linear
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A Scatterplot of log(Y) vs. log(X) reveals
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D. residuals plot for regression of Y on X shoes a curved patter

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