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Chapter 9: Q.52 (page 539)
Draw the general graph of the left-tailed test.
A graph of left-tailed test was represented.
To draw a graph of a left-tailed test
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From generation to generation, the mean age when smokers first start to smoke varies. However , the standard deviation pf that age remains constant of around years . A survey of smokers of this generation was done to see if the mean starting age is at least . the sample mean was with a sample standard deviation ofdo the data support the claim at the level?
According to the Center for Disease Control website, in at leastof high school students have smoked a cigarette. An Introduction to Statistics class in Davies County,KY conducted a hypothesis test at the local high school (a medium sized鈥揳pproximately students鈥搒mall city demographic) to determine if the local high school鈥檚 percentage was lower. One hundred fifty students were chosen at random and surveyed. Of the students surveyed, have smoked. Use a significance level of and using appropriate statistical evidence, conduct a hypothesis test and state the conclusions.
The National Institute of Mental Health published an article stating that in any one-year period, approximately a percent of American adults suffer from depression or a depressive illness. Suppose that in a survey of people in a certain town, seven of them suffered from depression or a depressive illness. If you were conducting a hypothesis test to determine if the true proportion of people in that town suffering from depression or a depressive illness is lower than the percent in the general adult American population, what would the null and alternative hypotheses be?
localid="1650439913140" __________
__________
A group of doctors is deciding whether or not to perform an operation. Suppose the null hypothesis, , is: the surgical procedure will go well. State the Type I and Type II errors in complete sentences.
Which distribution do you use when you are testing a population mean and the population standard deviation is known? Assume a normal distribution, with .
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