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zubka84 [21]
2 years ago
9

Find value of x such that the data set has a mean of 105: 99, 119, 106, 112; 108

Mathematics
1 answer:
Marizza181 [45]2 years ago
6 0
I'm assuming that x is part of the data set, and, with x, the mean equals 105. To find the value of x, you must add all the data values together to get 544+x (you still don't know what x equals). Then put 544+x over how many days values there are, including x (there are 6). You should have 544+x/6. Now, as this is how you would calculate the mean if you knew what x was equal to, you must set it equal to the mean, since you know what it is (105). You should now have 544+x/6 = 105. You have your equation set up--now you just have to solve it. I would multiply by 6 on both sides to get rid of the 6 on the left side. You would then have 544+x = 630. I would finally subtract 544 from both sides to get x = 86. Your final answer is x = 86.
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Step-by-step explanation:

1)  Test for the equality of variances in the two groups to choose the appropriate t-test.  

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Ha: σ (1)^2 ≠ σ (2)^2  

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Sample 1 size 7  

Sample 2 size 8  

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Sample 2 mean 84  

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Sample 2 S.D. 8  

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= (-13.04, 3.04)  

Interval encloses 0  

We are 95% confident that there is no statistically significant difference in the mean treatment  methods for hostility.  

4 0
3 years ago
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3 years ago
Based on the graph below, what is the y-intercept?
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Answer:

the y intercept you are looking for is -3

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