Analysis of variance
Why does analysis of variance should be conducted only when population variances can be assumed to be equal? why not when they are approximately equal? Is it because there is no way of knowing the population variances?
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When running a non-parametric test on SPSS with a small sample size, which test statistic will NOT provide the most accurate result?
The time interval between two successive customers entering a store in a mall is exponentially distributed with a mean of 6.55 seconds. What is the probability that the time interval is more than 10 seconds?
The power generated by a solar electric generator is normally distributed with mean 15.6 kilowatts and standard deviation of 4.1 kilowatts. We may be 95% sure that the generator will deliver at least how many kilowatts?
A sample of 250 observations is selected from a normal population for which the population standard deviation is known to be 24. The sample mean is 20.
A researcher was interested in determining the effect of an experimental drug on the lifespan of laboratory rats. Shown below is a summary of lifespans, in months, for laboratory animals administered the drug.
Suppose a highlighter manufacturer wanted to find out whether a highlighter lasted longer than the claim of 14 continuous hours. They tested 40 highlighters and recorded the number of continuous hours the highlighter wrote before drying up.
As their sample size increases, what's the expected shape of the distribution of amounts purchased in the sample? As the sample size increases, what's the expected shape of the sampling model for the mean amount purchased for the sample?
A population variance 34. What is the standard deviation ? What if n= 14 what would be the standard deviation of the mean?
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