Answer:
25%
Step-by-step explanation:
I hope this helps!!
Answer:
75%
Step-by-step explanation:
8/8 - 2/8 = 6/8
6/8 = 3/4
3 ÷ 4 = 0.75
0.75 ⋅ 100 = 75%
Answer: In terms of percent, the salinity of most sea water is between 2.5 and 4.5
Step-by-step explanation:
Answer:
No it is not
Step-by-step explanation:
The median is 84200
The mean is 85300
Low income is 65100
High income is 103400
From this information, we can see a skewed data. The mean would not be a good estimate value. Rather the center (median) would be more appropriate.
When we calculate the middle value for this data
65100+103400 = 168500/2 = 84250
84250 is closer to the median score of 84200. The median is best in the presence of outliers.
Answer:
There is not evidence that the population mean waiting time is different from 3.9 minutes.
Step-by-step explanation:
From the question we know that the size (n), the mean (x) and the standard deviation (s) of the sample are 81, 4.05 minutes and 0.9 minutes. Additionally, we are going to decide if the waiting time is different or not form 3.9 minutes, so the null and alternative hypotheses are:
H0: m=3.9
H1: m≠3.9
Where m is the mean of the population.
Then, <em>we don't need to be concerned about the shape of the population distribution because the value of the n is bigger than 30</em> and we can use the statistic z as:
So, replacing the values, the test statistic is:
On the other hand, the p value for this test is calculated as:
p value = 2P(z>1.50) = 2(0.0668) = 0.134
Taking into account that the p value is bigger than the level of significance 0.01, the null hypothesis is not reject, and there is not evidence that the population mean waiting time is different from 3.9 minutes.