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Suppose that a simple random sample is used to estimate the proportion of families in a certain area that are living below the poverty level. If this proportion is roughly 0.15, what sample size is necessary so that the standard error of the estimate is 0.02?
The following data represent scores of 50 students in the applied business statistics test. Prepare the frequency distribution table and the frequency histogram for this data set.
The publisher of Celebrity Living claims that the mean sales for personality magazines that feature people such as Angelina Jolie or Paris Hilton are 1.5 million copies per week.
Is there evidence of a significant difference in the proportion who get their news primarily from newspapers between those 36 to 50 years old and those above 50 years old? (use α = 0.05)
Can we conclude that car size is dependent on marital status? YES or NO (circle one)
What is the probability that there will be more than three trucks either being loaded or waiting?
Create a scatter plot for those data. Based on scatter plot, how would you explain relationship between the two variable.
The data was used to make inferences regarding the other students taking the course. Construct a 95% confidence interval estimate. Explain your findings so that your non-quantitative partner will understand them. Their data is below:
It is impossible to obtain a standard error less than 2 for any sized sample.
A sample of 10 observations is selected from a normal population for which the population standard deviation is known to be 4. The sample mean is 23. (Round your answers to 3 decimal places.) (a) The standard error of the mean is_____?
Using the information provided in part (d) would you be surprised if a sample of 50 differences collected in this way resulted in a higher mean number of unpopped kernels for the store brand than for the name brand?
Forty percent of the sample wanted more local news. What is the 99% confidence interval for the proportion of readers who would like more coverage of local news?
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
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