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Roger has read a report that the weights of adult mail Siberian tigers have a distribution which is approximately normal with mean μ = 390 lb and σ = 65 lb.
a) Find the probability that an individual male Siberian tiger will weigh more than 450 lb.
b) Find the probability that a random sample of 4 male Siberian tigers will have a sample mean weight more than 450 lb.
He measures the heights of 25 men from this century and finds the mean and standard deviation for his sample.
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
In fitting the simple linear regression model Yi ~ N (α + β xi, σ 2 ) to the following data:
2 laptops are chosen at random without replacement, what is the probability that both are high priced?
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
What is the probability you pick a plum and Which of the following is a legitimate probability distribution for this situation
The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Assume the batch contains 1% defective syringes.
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
What decision should be made regarding the null hypothesis?
Test out an suitable hypothesis also state your conclusion. Make sure the suitable assumption as well as conditions are satisfied before you proceed.
Calculate probability that the sample would have a mean:
At 0.01 significance level can we conclude that mean fare has increased? Determine the p-value?
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