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In the MLS, teams furnish the soccer balls they use for games. The soccer balls are supposed to be inflated to about 13 psi (lb/in2). The distribution of air pressure measurements approximates a normal distribution, with mean 13 and standard deviation 0.25.
The DC United has been accused of over-inflating their soccer balls to make them easier to kick. To check this claim, the MLS gathers a random sample of 10 soccer balls approved pre-game by the LA Galaxy, and they measure the psi for each. The average air pressure of the 10 balls comes out to 11 psi.
Conduct a test of significance to determine whether the difference would be great enough to be considered "statistically significant" (not explained by chance variation). Use an alpha-level of 0.05. and submit the hypotheses, define variables, and state the test statistic, p-value and conclusion. Draw the bell curve, and indicate the location of the sample mean.
A lumber company has claimed that the standard deviation for the lengths of their 6 foot boards is 0.5 inches or less. To test their claim , a random sample of 17 six-foot boards is selected
Assume each lifetime is independent. Round your answer to four decimal places (e.g. 98.7654). What is the probability that the lathe will operate at least seven years?
Approximately what is the mean ideal number of children? Explain how you chose this value.Which is more appropriate to report for these data.
1) Find the area under the standard normal curve that lies between z = -2.4 and z= 1
A man is on trial accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can be modeled as a significance test with the followi..
if i build a regression model with two independent variables that are highly correlated which violation of the
The article also indicated that 20% of those working full time work more than 49 hours per week. Determine the standard deviation with this information.
weakly earnings on a certain import venture are approximately normally distributed with a known mean of 219 and unknown
If the outcome is tails, you win nothing. Let X be the amount that you win in a single toss of a coin. Find the probability distribution of this random variable and its mean.
According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed.
let x and y be i.i.d.unif01and let wx-y.a find the mean and variance of w without yet deriving the pdf.b show that the
What is the value of the population mean? What is the best estimate of the value?
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