Please help me get the answers.
1 answer:
The answers are
1.
2.
3.
What are fractions?
Any number of equal parts is represented by a fraction, which also represents a portion of a whole. In ordinary English, a fraction refers to the number of parts of a specific size.
We are given,
1.
As the denominator of both fractions are same we add the numerator
We get,
2.
As the denominator of both the fractions are same we subtract the value in the numerator we get,
3.
We first simplify the first term of the equation,
Now as the denominator is not same we use cross multiplication to perform the operation
On further simplifying we get,
Hence the answers are
1. 1
2.
3.
To refer more about the fraction please refer
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Answer:
Step-by-step explanation:
The mean SAT score is , we are going to call it \mu since it's the "true" mean
The standard deviation (we are going to call it ) is
Next they draw a random sample of n=70 students, and they got a mean score (denoted by ) of
The test then boils down to the question if the score of 613 obtained by the students in the sample is statistically bigger that the "true" mean of 600.
- So the Null Hypothesis
- The alternative would be then the opposite
The test statistic for this type of test takes the form
and this test statistic follows a normal distribution. This last part is quite important because it will tell us where to look for the critical value. The problem ask for a 0.05 significance level. Looking at the normal distribution table, the critical value that leaves .05% in the upper tail is 1.645.
With this we can then replace the values in the test statistic and compare it to the critical value of 1.645.