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A random sample of 80 Tempe city employees average 13.1 years of education. A random sample of 75 Mesa city employees average 13.3 years of education. Which test should we use to determine whether the difference between Mesa and Tempe is statistically significant? Why? Should it be one or two-tailed?
Report the t-value, whether you accept or reject Ho, and whether the difference was significant in a brief sentence.
As we can say there is 5.5 percent chance of seeing the current policy having an effect on smog in the results we observed from natural sampling variation.
Find out the mean sum of squares of the treatment in one way ANOVA.The profits of individual traders in three departments, labelled by A, B and C, in a medium sized firm were recorded on one day.
A school tracks the absences of pupils as part of a flu surveillance system. Regular reporting of absences among 25 students in grade 1 are taken, and based on these data, the long-run proportion of absences under normal conditions is estimated to..
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Confirm whether given random variable is binomial distribution or not. If this experiment is finished with replacement, explain why.
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
Assume a population standard deviation of 450-kilowatt hours. Determine the standard error of the mean.
Find the area under the normal distribution curve to the right of z = -1.03.
Compute mean, standard deviation, coefficient of variation and 5 key percentiles for these data.
If 50 cups of coffee were measured, what is the probability that: The sample mean per cup is less than 7.8 ounces?
Number of rescue calls received by rescue squad in city follows a Poisson distribution with mu = 2.83 per day. Squad can handle at most four calls a day. Determine the probability that squad will be able to handle all calls on a particular day?
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