Exponents: Can me help me? This is the one, I just can't get.
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Answer:
The 98% confidence interval for the average credit card balance is
(564.04, 635.96).
Step-by-step explanation:
We have to calculate the 98% confidence interval on the average credit card balance.
The sample will consist of the n=30 customers that have credit card.
The sample has a mean of $600 and a standard deviation of $80.
As the population standard deviation is estimated from the sample standard deviation, we will use a t statistic.
The degrees of freedom are:
The critical value for a 98% CI and 29 degrees of freedom is t=2.463 (this can be looked up in a t-table).
Then, the margin of error is:
Then, the upper and lower bounds of the confidence interval are:
Answer:
Step-by-step explanation:
First, turn around into Slope-Intercept Form:
3x - y = 4
-3x - 3x
________
−y = −3x + 4
The <em>rate</em><em> </em><em>of</em><em> </em><em>change</em><em> </em>[<em>slope</em>] is 3:
−2 = 3[−1] + b
−3
1 = b
* Parallel lines have SIMILAR <em>RATE OF CHANGES</em> [<em>SLOPES</em>], so 3 remains the way it is.
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