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In a second grade class containing 12 girls and 7 boys, 2 students are selected at random to give out the math papers. What is the probability that both are girls?
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 500 and a population standard deviation of 6 and a sample size of 18.
It was reported that 20 readers responded and 87% said "no" whiles 13% said "yes". Identify four major flaws of the situation. Explain why you chose them.
Estimating a linear regression equation to predict the future values of the dependent variable Y.
The average delivery time is 26.7 with a standard deviation of 8.527. If the customer estimates the time using a 99% confidence interval, what is the margin of error?
Your company is considering submitting a bid on a major project. You determine that the expected completion time is 100 weeks and the standard deviation is 10 weeks.
At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?
The time in minutes until the paint was dry enough for a second coat to be applied was recorded. The following data were obtained. Test to see whether the mean drying time is the same for each type of paint.
A real estate broker hoped to develop an equation that could be used to predict the sales price of homes in a certain suburb. It seemed to him that the most important variable
Shopping time: House wares. How much customers buy is a direct result of how much time they spend in a store. The mean shopping time for women accompanied by children in national house wares stores is 7.3 minutes.
Explain the distribution using the following characteristics. Determine the shape of the distribution. what score best identifies the center (average) for the distribution.
What is the probability that the 100 randomly selected mangoes have a mean weight less than 14 ounces?
The length of a Colorado brook trout is normally distributed. What is the probability that a brook trout's length, (Round your answers to 4 decimal places.)
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