Exam 8: Testing Hypotheses

Making assumptions and selecting the sampling distribution are steps involved in

Alpha is the level of probability at which the null hypothesis is accepted.

In a simple random sample of 120 women and 150 men from a population of 150,000,25% of the women and 37% of the men are smokers.Suppose you are interested in comparing the proportion of smokers by sex,compute the Z statistic.

When conducting a statistical hypothesis test,what is it that we are actually doing?

The t distribution is also bell-shaped like the standard normal distribution.

Which of the following is the symbol for the sample variance?

Suppose you are interested in comparing the mean number of hours worked by sex.State the null and the research hypotheses.

If the sample variances of two sets of people are 2.15 and 2.04 with sample sizes 50 each,then the estimated standard error is .29.

SELECT ALL THAT APPLY. -Some of the assumptions in statistical hypothesis testing include that

Suppose you are interested in testing whether the mean earning of men in California differs significantly from the mean earning of men in New York.If the number of men from California in the sample is 123 and the number of men from New York in the sample is 88,how many degrees of freedom are there?

Two sample hypothesis testing assumes that the samples are

Imagine you wish to determine whether the mean number of hours worked per week by men in a sample differs from the 40-hour standard.Use the information below to calculate the value of the single-sample t statistic.

Define Type I and Type II error.

SELECT ALL THAT APPLY. -To calculate the t statistic,we need to know the values of

The null hypothesis is symbolized as

What three quantities do you need in order to calculate the independent samples t statistic?

The probability associated with failing to reject the null hypothesis when it is false is called

If the sample variances of two sets of people are 2.15 and 2.04 with sample sizes 50 each,then the t statistic for a difference between means 43.10 AND 40.26 is .29.

According to the Central Limit Theorem,if the sample size is larger than 50,the sampling distribution of the mean is

Suppose you are interested in testing whether the mean earning of men in the General Social Survey is representative of the earning of the entire U.S.male population.If there are 372 men in the General Social Survey sample and approximately 128 million men in the population,calculate the degrees of freedom for this single-sample t test.