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X is a normally distributed random variable with a mean of 5.00. If the probability thatXis less than 6.32 is 0.67 (as shown below), then what is the standard deviation of X?
Construct the confidence interval to find the estimated margin of error. Then find the sample mean - A biologist reports a confidence interval of (3.3,4.5) when estimating the mean height (in centimeters) of a sample of seedlings.
What is the purpose of sampling? What are some concerns and dangers of sampling? How important is the sample design to data validity? Explain.
For an arch chosen at random in Arches National Park, use the preceding information to estimate the probability that the height of the arch poening is:
general instructionsuse the spss data file produced from the national child development study ncds to answer the
In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had ..
A random sample of 25 days' receipts is chosen for an audit. What is the probability that the sample mean is larger than $2,220?
A machine produces 3 inch nails. A sample of 100 nails is selected, and it is found that 25 are shorter than 3 inches. Find the 95% confidence interval on the proportion of all such nails that are shorter than 3 inches.
if the sample mean is 8 the hypothesized population mean is 4 and the population standard deviation is 2 compute the
Assumed to have 20 pounds of carry-on baggage, find the probability that his total is greater than 195 pounds. Round your answer to three decimal places.
In the regards to a stem-and-leaf plot that best represents the given data, what would the stem be? Determine which stem would have the most leaves and explain what this means in terms of the GPA's.
If the 95% confidence interval for the average age of a learner at Capella is 27.8 yrs.
At the .05 significance level, can we conclude that there is a difference in their mean times?
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