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Assume that, overall, the proportion of high school seniors with no siblings is 0.05. If we take a sample of seniors from a particular private high school, can we say that sample proportion with no siblings has mean 0.05?
Suppose that $126,000 is to be allocated for advertising, research, and investment in the ratio 10:4:2. How much money will be allocated for each?
Interpret the slope and intercept of the regression model.- What does the value of say about how successful the model is?- Interpret in this context.
A Regression to predict sodium content from calories had a correlation of r = 0.8781. The calories averaged 168 calories, with a standard deviation of 28.6 and the sodium content averaged 422 mg, with a standard deviation of 114 mg.
Growth of pine trees. The Department of Biology at Kenyon College conducted an experiment to study the growth of pine trees. In April 1990, volunteers planted 1000 white pine (Pinus strobus) seedlings at the Brown Family Environmental Center. The ..
The annual returns, in percentages, on stocks A and B for three possible states of the economy are given in the table below.
The chart at the right. Does this sample indicate that songs classified as dance music have lower beats per minute than the songs ranked on a Top 200 list?
Do you think that you can use the large-sample confidence intervals for a difference in proportions to compare teens' use of computers with teens' use of consoles? Write a short paragraph giving the reason for your answer.
She wants to test H0: μ = 0.5 Ha: μ ≠ 0.5 Find the associated P-value. Is the result significant at the 5% level (α = 0.05)? At the 1% level (α = 0.01)?
q1. a normally distributed population has a mean of 40 and a standard deviation of 12. what does the central limit
A real estate investor has two houses: A and B. Each house may increase in value, decrease in value, or remain unchanged. Consider the experiment of investing in the two houses and observing the change (if any) in value:
The average hourly workweek varies from country to country for industrial workers.- What kind of graph is appropriate for these data? Create a graph and execute it.
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
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