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Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints. The time in minutes until the paint was dry enough for a second coat to be applied was recorded. The following data were obtained.
Paint 1 Paint 2 Paint 3 Paint 4128 144 133 150137 133 143 142135 142 137 135124 146 136 140141 130 131 153
At the .05 level of significance, test to see whether the mean drying time is the same for each type of paint.
With your start time being random and uniformly distributed in this interval. What is the PDF of the time that you have to wait for the first train to arrive?
A business operates with 9 locations. Each year, each location is allotted an overtime budget based on the previous years' activity. The total overtime budget for all 9 locations is $10 million.
In a completely randomized experimental design, 18 experimental units were used for the first treatment, 10 experimental units were used for the second treatent, and 15 experimental unites were used for the first treatment.
From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed).
The U.S. Food and Drug Administration (FDA) performed a study that compared the carbohydrate content (as a percentage of weight) of several major brands of corn and potato chips.
If she actually has 55% of the total vote, what is the probability of getting a sample proportion this small or smaller? Do you think she actually has 55% of the vote? Why or why not?
The following data represents the amount of time in minutes that a person had to wait for a bus to work on a random sample of 5 working days.
Determine the minimum sample size to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.2 years.
The critical value of F at 95% confidence when there is a sample size of 21 for the sample with the smaller variance, and there is a sample size of 9 for the sample with the larger sample variance is:
What is the 95% confidence interval for the mean number of microwaves sold at a retail store in the chain last week?
Each candy in a paper cup and then obtaining the weight without accounting for the weight of the cup. How can this as a random error and systematic error?
For the population with mean of (u)=50 and standard deviation of (o)=10, how much error on average would you expect between sample mean (M) and population mean for given samples
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