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State the decision rule for the mean has changed or not from 6.0
The annual turnover rate of the 200-count bottle of aspirin follows the normal distribution with a mean of 6.0 and a standard deviation of 0.50. (This indicates that the stock of asprin turns over on the pharmacy shelves an average of 6 times per year.) It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
A. State the decision rule.
B. Give the formula for the test statistic.
Give critical test statistic and compute sample test statistic. Test null hypothesis at alpha level .01.
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
The distribution of lifetimes for a certain type of light bulb is normally distributed with a mean of 1000 hours and a standard deviation of 100 hours. Find the 33rd percentile of the distribution of lifetimes.
A researcher hypothesizes that parents with school-aged children are more probable to vote in favour of a referendum increasing public school spending than adults without school-aged children, but wonders of this relationship holds for both Democr..
What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams?
At α = .01, did yellow fire trucks have a considerably lower accident rate? Determine sample proportions and z test statistic.
Place the steps below in the correct order for the construction of a control chart.
Suppose there is no cyclical component. Quarterly billing for water usage is shown below describe summer billing for year 5.
What is the probability of receiving more than three pieces of junk mail today?
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
Determine the special property of standard normal distribution, compared to other normal distributions?
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