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If 10% of the parts produced from a manufacturing process are defective, what is the probability that there are 15 or more defectives in a random sample of 100 items?
A population is normally distributed with the mean of 100 and a standard deviation of Would it be unusual for mean of sample of 3 to be 115 or more? Why or why not?
Four different assembly processes were under consideration. Sixteen workers were randomly assigned to the four processes, eight per process. The number of correctly assembled units in an eight-hour work shift was recorded:
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
A large population of metal rods have an average diameter of .943 inches with a standard deviation of .001 inches. The engineering specification for the rods requires that they be between .941 and .944 inches.
Linda would like to maintain a 90% service level. what safety stock level do you recommend for BX-5?
Construct a 99% confidence interval for the population mean tread wear for this type of tire.
State a type I error and describe why it happens. Describe the factor that researcher can control to change type I error. Also, describe how type I errors can be avoided.
At the Statsville County Fair, the probability of winning a prize in the ring-toss game is 0.1. Show the probability distribution for the number of prizes won in 8 games.
Does it seem prevention plans were effective in reducing mean amount of a claim? Use 0.05 level of significance. Set up Null and Alternate Hypothesis.
In a simple linear regression analysis of 18 data points the following ANOVA table was found.
It's estimated that 57% of Americans live in households with 1 or 2 people, 32% live in households with 3 or 4 people and 11% live in households with 5 or more.
The ANOVA procedure is a statistical approach for determining whether or not:
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