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What is the approximate width of a 90% confidence interval for the true population proportion if there are 12 successes in a sample of 25?
A. ± .196
B. ± .164
C. ± .480
D. ± .206
30% student take only Chinese, 30 % student take only Maths. It is found that both male n female has the equal chance to wear spectacles. Draw a tree diagram.
question a researcher wants to conduct a beforeafter study on 15 subjects to determine if a treatment results in any
question a survey of the opinions of property owners about a street widening project was taken to determine whether the
Based on past data, the Student Recreation Center knew that the proportion of students who prefer exercising outside over exercising in a gym was 0.734. To update their records, the SRC conducted a survey. Out of 95 students surveyed, 76 indicated..
the route used by a certain motorist in commuting to work contains two intersections with traffic signals. the
What should the cut-off score be for the interviews? (Round to nearest whole number).
How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 pound of the true population mean? Assume that the population standard deviation is known to be 10.6 lb.
Convert each of the following z intervals to raw score x intervals:
P(A 1 )= .20, P(A 2 ), and P(A 3 )= .40. P(B 1 I A 1 ) = .25. P(B 1 I A 2 ) = .05. P(B 1 I A 3 )=.10. Use Bayes' theorem to determine P(A 3 I B 1 )
there is 20 chance that a customer of one vehicle insurance company will file accident claims within the insurance
The underlying data are in file XR10033. Identify and interpret the p-value for the test. Using the 0.025 level of significance, what conclusion will be reached?
a researcher wishes to try three different techniques to lower the blood pressure of individuals with high blood
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