Stats final

More evidence against H0 is indicated by

smaller p-values

x is a normally distributed random variable with a mean of 12 and a standard deviation of 3. The probability that x equals 19.62 is

0.000

For a standard normal distribution, the probability of z 0 is

0.5

If a categorical independent variable contains two categories, then _________ dummy variable(s) will be needed to uniquely represent these categories.

1

If the mean of a normal distribution is negative,

None of these alternatives is correct.

In regression analysis, which of the following assumptions is not true about the error term ε?

The expected value of the error is one

What type of error occurs if you fail to reject H0 when, in fact, it is not true?

Type II

A normal distribution with a mean of 0 and a standard deviation of 1 is called

a standard normal distribution.

A Type I error is committed when

a true null hypothesis is rejected

In interval estimation, as the sample size becomes larger, the interval estimate

becomes narrower

As the number of degrees of freedom for a t distribution increases, the difference between the t distribution and the standard normal distribution

becomes smaller

The proportion of the variation in the dependent variable y that is explained by the estimated regression equation is measured by the

coefficient of determination

To compute the minimum sample size for an interval estimate of µ, we must first determine all of the following except​

degrees of freedom.

The center of a normal curve is

is the mean of the distribution.

The value added to and subtracted from a point estimate in order to develop an interval estimate of population parameter is known as the

margin of error

If the null hypothesis is rejected at the 5% level of significance, it

may be rejected or not rejected at the 1% level

In a standard normal distribution, the

mean is 0 and the standard deviation is 1.

The p-value

must be a number between zero and one

When constructing a confidence interval for the population mean using the standard deviation of the sample, the degrees of freedom for the t distribution equals

n - 1

Convenience sampling is an example of

nonprobabilistic sampling.

A sample of 92 observations is taken from an infinite population. The sampling distribution of is approximately

normal because of the central limit theorem.

A sample of 200 elements from a population with a known standard deviation is selected. For an interval estimation of μ, the proper distribution to use is the

normal distribution

The number of degrees of freedom associated with the chi-square distribution in a test of independence is

number of rows minus 1 times number of columns minus 1.

Which of the following is(are) point estimator(s)?

s

The required condition for using an ANOVA procedure on data from several populations is that the

sampled populations have equal variances

In interval estimation, the t distribution is applicable only when

the sample standard deviation is used to estimate the population standard deviation.

For a normal distribution, a negative value of z indicates

the z is to the left of the mean.

The ANOVA procedure is a statistical approach for determining whether or not the means of

three or more populations are equal.

If we change a 95% confidence interval estimate to a 99% confidence interval estimate, we can expect the

width of the confidence interval to increase.