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1. The U.S. Commission of Crime wishes to estimate the fraction of crimes related to firearms in an area with one of the highest crime rates in the country. The commission randomly selects 600 files of recently committed crimes in an area and finds 380 in which a firearm was reportedly used. Construct the 95% confidence intervals for p , the true population proportion of crimes in the area in which some type of firearm was reportedly used.
2. A pollster wishes to estimate the proportion of United States voters who favor capital punishment. Find the minimum sample size "n" that is needed to estimate p, the population proportion of voters who favor capital punishment. The pollster wants to be 90% confident that the sample proportion will not differ from the true proportion by more than 4%.
Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
Inverse probability based on normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
If the sum of the squared deviations about the regression line is SSE = 40.0, what is the coefficient of determination?
With any statistical model, we assess the fit: Does the model accurately depict the truth? Explain how one of the following helps assess the "fitness" of the mean.
At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p -value.
A decision maker is working on a problem that requires her to study the uncertainty surrounding the payoff of an investment. There are three possible levels of payoff -$1,000, $5,000, and $10,000.
Comprise appropriate (BPS formatted) descriptive statistics table inferential statistics table.
Is the distinction among various parts of the bell-shaped curve arbitrary or is there certain logical and rational principle involved that creates such distinctive demarcations shown in a chart like this?
In a mobile phone shop on a Sunday morning, out of n = 77 customers x = 19 buy a mobile phone. What is the 95% confidence interval for the proportion of customers buying a mobile phone?
What is the point estimate of the difference between the population mean expenditure for males and the population means expenditure for females?
According to the empirical rule, if the data from a "bell-shaped" normal distribution ______ percent of the observation will be contained between 2 standard deviations below the mean and 2 standard deviations above the mean.
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