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H0 : μ ≥ 220
H1 : μ < 220
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the population standard deviation is 15. Conduct the following test of hypothesis using the .025 significance level.
You have asked to research the high absenteeism rate in your company. One required analysis is to be by gender. Assume you have been asked to do the study via a survey.
Running a study comparing 3 different products on five different experimental visits. The same subjects are used for each visit and the same tests are carried out each time on all 3 products. What is the best way to radomise the presentation of the 3..
the diameters of a new species of apple have a bell-shaped distribution with a mean of 7.26cm and a standard deviation
a production process requires a fixed cost of 50000. the variable cost per unit is 25 and the revenue per unit is
For a disease such as pancreatic cancer, which is highly fatal and of short duration:
1. A topological space (S, T ) is called perfectly normal iff for every closed set F there is a continuous real function f on S with F = f -1({0}).
it is known that 20 of the applications received for a particular credit card are rejected. what is the probability
Compute the power of the previous test if the true proportion of adults having access to the internet in the population is 41%. What is the power if the true proportion is 42%? 43%?
You are reading an article detailing a study designed to compare the average body mass index among hypertensive individuals (persons with high blood pressure) to normotensive individuals. The study was conducted using participants in a health pla..
An electric scale gives a reading equal to the true weight plus a random error that is normally distributed with mean 0 and standard deviation σ = .1 mg. Suppose that the results of five successive weighings of the same object are as follows: 3..
We want to determine if the proportion of people in the population who believes this is less than 0.75. What is the p-value?
for the given pair of events classify the two events as independent or dependent. driving 30mph over the speed limit
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