You have to multiply by the complex conjugate so that you can clear the radical from the denominator.
Once you do the multiplication simplify the radical. There's still a common factor in -54, -18, & 75 so divide all those by 3.
If there are 19 red marbles for every black marble in a bag of 120 marbles, how many red marbles are in the bag?
2 answers:
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Answer:
The conclusion for this hypothesis test would be that the average American consumes less than or equal to 17 ounces of ice cream per month.
Step-by-step explanation:
We are given that Breyers is a major producer of ice cream and would like to test if the average American consumes more than 17 ounces of ice cream per month.
A random sample of 25 Americans was found to consume an average of 19 ounces of ice cream last month. The standard deviation for this sample was 5 ounces.
<u><em>Let </em></u><u><em> = average ounces of ice cream consumed by American per month</em></u>
So, Null Hypothesis, :
17 ounces {means that the average American consumes less than or equal to 17 ounces of ice cream per month}
Alternate Hypothesis, :
> 17 ounces {means that the average American consumes more than 17 ounces of ice cream per month}
The test statistics that will be used here is <u>One-sample t test statistics</u> as we don't know about population standard deviation;
T.S. = ~
where, = sample average = 19 ounces
s = sample standard deviation = 5 ounces
n = sample of Americans = 25
So, <u><em>test statistics</em></u> = ~
= 2
The value of the test statistics is 2.
<em>Now at 0.025 significance level, the </em><u><em>t table gives critical value of 2.06 at 24 degree of freedom for right-tailed test</em></u><em>. Since our test statistics is less than the critical values of t, so we have insufficient evidence to reject our null hypothesis as it will not fall in the rejection region due to </em><u><em>which we fail to reject our null hypothesis</em></u><em>.</em>
Therefore, we conclude that the the average American consumes less than or equal to 17 ounces of ice cream per month.