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Confidence intervals, again. Several factors are involved in the creation of a confidence interval. Among them are the sample size, the level of confidence, and the margin of error. Which statements are true?
a) For a given sample size, reducing the margin of error will mean lower confidence.
b) For a certain confidence level, you can get a smaller margin of error by selecting a bigger sample.
c) For a fixed margin of error, smaller samples will mean lower confidence.
d) For a given confidence level, a sample 9 times as large will make a margin of error one third as big.
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
A farmer in Iowa owns 45 acres of land. He is going to plant each acre with wheat or corn. Each acre planted with wheat yields $200 profit, requires 3 workers, and requires 2 tons of fertilizer; each with corn yields $300 profit, requires 2 worker..
one thousand raffle tickets are sold for 2.00 each. one grand prize of 800 and two consolation prizes of 100 each will
Develop a linear regression model for these data and forecast carpet sales if 30 construction permits for new homes are filed.
a water treatment plant needs to maintain the ph of the water in the reservoir at a certain level. to monitor this they
question below is the sample of baby deliveries in an 8 hour period at a small hospital13 14 6 12 13 8 6 14 4 78 7 5 9
The mean number of tasks completed successfully by all teams each day and the standard deviation is computed. The results are given below. The ANOVA F-test statistic value is?
The Wall Street Journal reported that long term Treasury bonds had a mean return of 24.03% in 2008. Assume that the returns for the long term Treasury bonds were distributed as a normal random variable, with a mean of 24.03 and a standard deviatio..
At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
Data is distribution of the most popular colors for 2005 model luxury cars made in North America. Design the pie chart and bar graph for data.
Determine whether the sampling method is independent or dependent for the following example. A researcher wants to know whether the newly issued "state" quarters have a mean weight that is different from "traditional" quarters.
Use these data to develop an estimated regression equation that could be used to predict the price of a hydration system given its weight.
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