Unit 2 stats test
To construct an interval estimate for the difference between the means of two populations when the standard deviations of the two populations are unknown and it can be assumed the two populations have equal variances, we must use a t distribution with (let n1 be the sample 1 and n2 be sample size 2)
(n1+n2-1) degrees of freedom
Generally, the __________________ sample procedure for inferences about two population means provide better precision than the _____________ sample approach
matched, independent
The number of degrees of freedom associated with the chi-square distribution in a test of independence is
number of rows minus 1 times numbers of columns minus 1
The process of allocating the total sum of squares and degrees of freedom to the various components is called
partitioning
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
The F ratio in a completely randomized ANOVA is given by
MSTR/MSE
In an analysis of variance where the total sample size for the experiment is N and the number of populations is k, the mean square due to error is
SSE/ (N-k)
When an analysis of variance is performed on sample drawn from k populations, the mean square due to treatments (MSTR) is
SSTR/(k-1)
The test for goodness of fit and test of independence are designed for use with
categorical data
In the ANOVA, treatments refer to
different levels of a factor
An experimental design that permits simultaneous statistical conclusions about two or more factors is a
factorial design
A statistical test conducted to determine whether to reject or retain a hypothesized probability distribution for a population is known as a
goodness of fit test
The required condition for using an ANOVA procdure on data from several populations is that the
sample poulations 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
three or more populations are equal
In a factorial experiment, if there are x levels of factor A and y levels of factor B, there is a total of
xy treatment combinations