Econ 215 Stats exam Questions and Answers 2024
weighted average of the two sample proportions. ** Answ** In hypothesis tests about p1 - p2, the pooled estimator of p is a(n)
The sampling distribution of p1−p2 is approximated by a normal distribution if _____ are all greater than or equa...
Econ 215 Stats exam Questions and Answers 2024
weighted average of the two sample proportions. ** Answ** In hypothesis tests about p1 -
p2, the pooled estimator of p is a(n)
The sampling distribution of p1−p2 is approximated by a normal distribution if _____ are all
greater than or equal to 5. ** Answ** n1p1, n1(1 - p1), n2p2, n2(1 - p2)
In regression analysis, the error term ε is a random variable with a mean or expected value of
** Answ** 0 (Zero)
In regression analysis, which of the following assumptions is not true about the error term ε?
** Answ** The expected value of the error term is one.
A regression analysis between sales (y in $1000) and advertising (x in dollars) resulted in the
following equation:
y^=30,000+5x
The above equation implies that an ** Answ** increase of $1 in advertising is associated
with an increase of $5000 in sales.
In a regression and correlation analysis, if r2 = 1, then ** Answ** SSR = SST
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 size of sample
1 and n2 the size of sample 2) _____ degrees of freedom. ** Answ** (n1 + n2 - 2)
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 ** Answ** alternative hypothesis should state p1 -
p2 > 0.
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