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A sewage plant produces 50,000 gallons a day. 20% of the time it produces in excess of 60,000 gallons, what is the standard deviation in the amount produced per day.
would this prove that they are exceeding their goal, using α = .025?
What would be the correct null and alternative hypothesis for the following situation: The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greate..
suppose that x2 follows a chi-square distribution with 19 degrees of freedom. compute px2 lessthanorequalto 20. round
Draw ogives from the following data and measure the median value and compute the value of arithmetic mean
determine the point estimate of the population proportion the margin of error for the following confidence interval and
q1. a sample of 65 observations is selected from one population with a population standard deviation of 0.75. the
You take a random sample of pizzas sold during a one hour period over the next week. Group 1 and Group 2 The results are shown in the table to the at the bottom of this. Does the ad campaign make a difference? Can you suggest a different methodology ..
MoE's concessions manager believes the average amount that mall customers spend on food during a visit has increased over the historical average of $18.75, due to the opening of some new upscale restaurants in the mall. Use the data in the file to..
The value of the standardized test statistic
After calculating the sample size needed to estimate a population proportion to within 0.04, your statistics professor told you the maximum allowable error must be reduced to just .01. If the original calculation led to a sample size of 800, the s..
Discuss why the 90% and 99% confidence intervals are different. What would you expect to happen to the confidence interval in part A if the sample size was increased?
For the equation: x = e^-pt (C_1e^qt + C_2e^-qt), where C1 and C2 are arbitrary constants, if I let F = C1 + C2 and G = C1 - C2, how do I obtain:
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