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Please state whether the statement is true or wrong and state briefly why:
1. A fastener manufacturing company uses a chi-square goodness of fit test to determine if a population of all lengths of ¼ inch bolts it manufactures is distributed according to a normal distribution. If we reject the null hypothesis, it is reasonable to assume that the population distribution is at least approximately normally distributed.
2. In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic
3. The least squares simple linear regression line minimizes the sum squares of the vertical deviations between the line and the data points.
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
What is the probability that the sample mean will be greater than M = 510. In symbols, what is p (M>510)?
A process is out of control when:
Further, 20 students get both questions 1 and 2 incorrect, 15 get both questions 2 and 3 incorrect, and 8 get both questions 1 and 3 incorrect, and 7 get all three questions incorrect. Find the probability that a randomly selected student: a) Gets..
what are the probability of you having the disease?
You can allow the cup to overfill 4% of the time. What amount should you set as the mean amount of coffee to be dispensed?
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
At the .01 significance level, can we conclude that the 30-yeer mortgage rate for small banks is less than 6 percent? Estimate the p -value.
Use drinking as an excuse for outrageous behavior. including public nudity and dancing on tables. Find the standard error of this estimate. and interpret.
The following data represents the running time of films produced by 2 motion picture companies. Assume these are independent samples
The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03.
A newspaper conducted a statewide survey concerning a proposal to raise taxes to prevent budget cuts to education. The newspaper took a random sample (assume it is an SRS) of 1200 registered voters and found that 580 would vote to raise taxes. Let..
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