A company produces a women's bowling ball that is supposed to weigh exactly 14 pounds. Unfortunately, the company has a problem
1 answer:
Answer:
Step-by-step explanation:
Mean = 14
Std deviation of sample s = 0.64
n = sample size =7
Std error =
t critical for 95% two tailed = 2.02
Margin of error = 2.02*SE = 0.4886
a)Conf interval lower bound = 14-0.4886 = 13.5114
b)Upper bound = 14+0.4886 = 14.4886
c)Assumption
the data need to follow a normal distribution
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Answer:
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Step-by-step explanation:
For this case we define the random variable X as the number of entry-level swimmers and we are interested about the true population mean for this variable . On specific we want to test this:
Null hypothesis:
Alternative hypothesis:
And the statistic is given by:
The significance level is and since we are conducting a right tailed test we need to find a critical value who accumulate 0.01 of the area in the right of the normal standard distribution and we got:
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Very nice handwriting but the math and English are confusing.
Let's assume we're told
The subscript is important.
I think we're told the similar sum with 11 gives the smallest possible value for the sum. This is a rather cagey way of telling us 11 is the mean of the nine points. The mean is the number which minimizes the sum of squared deviations.
If 11 is the mean, the sum of the points is 9(11)=99.
Answer: 1080