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Suppose you wanted to estimate the proportion of adults who write with their left hands and decide to watch a sample of n people signing credit card receipts at a mall.
a. Do you think this sample would be representative for the question of interest? Explain.
b. Assuming that the sample was representative, how many people would you have to include to estimate the proportion with a margin of error of 5%?
c. Suppose you observed 500 people and 60 of them signed with their left hand. What interval of values would you give as being likely to contain the true proportion of people in the larger population who would sign with their left hand?
d. Is the sampling plan that was used a probability sampling plan? Explain.
If she actually has 55% of the total vote, what is the probability of getting a sample proportion this small or smaller? Do you think she actually has 55% of the vote? Why or why not?
a scientist attempts to perform a difficult experiment. she is successful in about 80 of her attempts. she attempts the
Marks on statistics midterm test are normally distributed with mean of 78 and a standard deviation of 6. Determine the probability that class of 50 has average midterm mark that is less than 75?
If, in a separate visit to the restaurant, the journalist is accompanied by three colleagues who also order a hamburger, what is the probability that at least 2 of these 4 customers will receive a hamburger that had a precooked weight greater than..
Dry bleach. In Exercise 27.10 (page 27-15) you gave the center line and control limits for an chart. What are the center line and control limits for an s chart for this process?
Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. What is the lower limit of the 90% confidence interval? What is the upper limit of the 90% confidence interval?
q1. for this assignment you will be provided with 2 clinical research questions on sample size and one published
If you had a research problem appropriate for ANOVA and it was based on the results from three samples, what would be the null hypothesis?
Pretests, posttests and threats to internal validity and please discuss all threats to internal validity.
Question: If the regression line is drawn as Y = C + 1075x, when X was 2 and y was 239, given that the intercept was 11. Calculate the residual
Calculate the coefficient of skewness and coefficient of variation of minutes spent commuting. What do these statistics tell us?
Both groups were given the same information about radiation therapy. If it resulted that 24 members of the first group and 12 of the second group elected to have surgery, what conclusions would you draw?
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