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In a survey, 1864 out of 2246 randomly selected adults in the United States said that texting while driving should be illegal (based on data from Zogby International). Consider a hypothesis test that uses a 0.05 significance level to test the claim that more than 80% of adults believe that texting while driving should be illegal. a. What is the sample proportion, p-hat? b. What would be the null hypothesis? c. What would be the alternate hypothesis? d. Construct a 95% confidence interval for the population proportion. e. Explain what this confidence interval means. f. By performing the hypothesis test, determine if the survey results support the claim or not.
Identify the independent and dependent variable, and state the research hypothesis for your study. The variables must be categorical variables.
the following data represent the costs in dollars of a sample of 30 postal mailings by a
in 1909 the danish botanist wilhelm johannsen did a number of studies of the inheritance of seed weight in the
Students in a statistics class at a large state university were given the survey in which one question asked was age (in years); one student was a retired person, and her age was an "outlier".
In all, 53 say "good." Does the poll give reason to conclude that more than half of all seniors think their job prospects are good? The hypotheses for a test to answer this question are?
The amount in each can and find the average, the probability that the average of the six cans will be between 11.9 and 12.1 oz equals which standard normal probability?
q1.in a recent study of 250 female freshmen showed that 70 did not want to work after marriage. find the 95 confidence
A candy company claims that 92% of consumers like their candies. To test this claim, 9571 people are selected at random from those who have eaten the company's candies.
You're operating a business in very competitive market. You're not yet the dominant player, but you have invested heavily in marketing and product development and it has paid off with a steady growth rate of 10%.
consider one city in a similar survey where the mean is working time is 508 minutes. assume the standard deviation of
fourth group was divided into small discussion groups. A high of 10 was possible. A sample of five tests was selected from each group. The test grade results were: At the 0.01 level, what is the critical value?
in conducting a survey what do you think is even more important than the size of the sample?
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