Answer: a. confidence level.
Step-by-step explanation:
Given : A newspaper provided a "snapshot" illustrating poll results from 1910 professionals who interview job applicants.
i.e. Sample size : n= 1910
The illustration showed that 26% of them said the biggest interview turnoff is that the applicant did not make an effort to learn about the job or the company.
The point estimate of the proportion of job applicants said the biggest interview turnoff is that the applicant did not make an effort to learn about the job or the company = p=0.26
[Note : The point estimate of the population proportion is basically the sample proportion.]
The margin of error was given as plus or minus 3 ±3 percentage points.
But confidence level is necessary to describe the margin of error .
A confidence interval tells how sure you are about the margin of error .
Thus , the important feature of the poll was omitted = confidence level
answer:2x + 7
Step-by-step explanation:
subtract polynomial 1 from the sum
Answer:49+2m
Step-by-step explanation:
49+2m
Increase,another way to say addition
Twice means “two times”
A number would be a variable since it’s unknown
Answer:
The calculated χ² = <u> 0.842 </u> does not fall in the critical region χ² ≥ 5.99 so we accept the null hypothesis that all the proportions are equal and there is not enough evidence to doubt the supermarket's claim.
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Step-by-step explanation:
1) We set up our null and alternative hypothesis as
H0: p1= 5/18, p2= 4/18, p3= 9/18
against the claim
Ha: p1≠ 5, p2≠ 4, p3≠ 9
2) the significance level alpha is set at 0.05
3) the test statistic under H0 is
χ²= ∑ (O - E)²/ E where O is the observed and E is the expected frequency
which has an approximate chi square distribution with 2 d.f
4) Computations:
Observed Expected χ²= ∑ (O - E)²/ E
5 5.4 0.0296
4 5.4 0.3629
<u>9 7.2 0.45 </u>
<u>∑ 0.842 </u>
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5) The critical region is χ² ≥ χ² (0.05)2 = 5.99
6) Conclusion:
The calculated χ² = <u> 0.842 </u> does not fall in the critical region χ² ≥ 5.99 so we accept the null hypothesis that all the proportions are equal and there is not enough evidence to doubt the supermarket's claim.
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Answer:
N = 85
Step-by-step explanation:
(236 + 542)+N = 863
778 + N = 863
N = 863 - 778
N = 85