Stats II Exam 2

The test statistic for goodness of fit has a chi-square distribution with k - 1 degrees of freedom provided that the expected frequencies for all categories are

5 or more

When σ1 and σ2 are unknown we will:

Use the sample standard deviations, s1 and s2, as estimates of σ1 and σ2

An important application of the chi-square distribution is

all of these alternatives are correct

If we are interested in testing whether the proportion of items in population 1 is larger than the proportion of items in population 2, the

alternative hypothesis should state p1 - p2 > 0.

If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means

can be approximated by a normal distribution.

The sampling distribution for a goodness of fit test is the _____ distribution.

chi-square

An experimental design where the experimental units are randomly assigned to the treatments is known as _____ design.

completely randomized

In the ANOVA, treatments refer to

different levels of a factor

In order to determine whether or not the means of two populations are equal,

either a t test or an analysis of variance can be performed.

In an ANOVA procedure, a term that means the same as the term "variable" is

factor

The independent variable of interest in an ANOVA procedure is called a

factor

When conducting a hypothesis test comparing two populations with independent samples, each observation from one sample is related to an observation from the other sample.

false

When performing matched-samples test the level of significance α is always equal to 0.05

false

In factorial designs, the response produced when the treatments of one factor interact with the treatments of another in influencing the response variable is known as

interaction

When each data value in one sample is matched with a corresponding data value in another sample, the samples are known as _____ samples.

matched

Of the two production methods, a company wants to identify the method with the smaller population mean completion time. One sample of workers is selected and each worker first uses one method and then uses the other method. The sampling procedure being used to collect completion time data is based on

matched samples

A population where each of its element is assigned to one and only one of several classes or categories is a _____ population.

multinomial

When developing an interval estimate for the difference between two population means with sample sizes of n1 and n2,

n1 and n2 can be of different sizes.

Which of the following is not a required assumption for the analysis of variance?

populations under consideration have equal means

Marascuilo procedure is used to test for a significant difference between pairs of population

proportions

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

sampled populations have equal variances

In the analysis of variance procedure (ANOVA), "factor" refers to

the independent variable

The ANOVA procedure is a statistical approach for determining whether or not the means of _____ are equal.

three or more populations

The hypothesis statement: H0 : μ1 - μ2 = 0 is an example of a two-tail hypothesis test.

true

When the confidence interval for the difference between two means does not include zero when testing H0 : μ1 - μ2 = 0 , we have support that a significant difference between population means does exist.

true