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Troyanec [42]
2 years ago
10

The proportional relationship between the number of hours a business operates and its total cost of electricity is shown in the

following graph.
Mathematics
1 answer:
aalyn [17]2 years ago
6 0

Answer:

The answer is A.

Step-by-step explanation:

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Data from Ivy Tech's advising center shows the wait times as a normal distribution with the average as 20 min and a standard dev
fiasKO [112]

9514 1404 393

Answer:

  68%

Step-by-step explanation:

According to the empirical rule, 68% of the distribution lies within 1 standard deviation of the mean.

Here, the mean is 20 and the standard deviation is 5. The bounds on 1 standard deviation from the mean are 20±5 = [15, 25]. This is precisely the interval of interest.

  68% of students wait between 15 and 25 minutes

8 0
2 years ago
A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh) wa
grin007 [14]

Answer:

The 98% confidence interval for the mean usage in the March quarter of 2006, in kWh, was (333.87, 416.13).

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 30 - 1 = 29

98% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 29 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.98}{2} = 0.99. So we have T = 2.462

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.462\frac{91.5}{\sqrt{30}} = 41.13

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 375 - 41.13 = 333.87 kWh

The upper end of the interval is the sample mean added to M. So it is 375 + 41.13 = 416.13 kWh

The 98% confidence interval for the mean usage in the March quarter of 2006, in kWh, was (333.87, 416.13).

6 0
3 years ago
Plz, help ASAP!!!!!!!
Marina86 [1]

Answer: correct.

Step-by-step explanation:

8 0
3 years ago
Is this in the right order?
PIT_PIT [208]

Answer:

yes it is in the right order

3 0
3 years ago
Read 2 more answers
Assume that you plan to use a significance level of α = 0.05 to test the claim that p1 = p2, use the given sample sizes and numb
11Alexandr11 [23.1K]
Since the data is insufficient. Let us denote that n1 = 100, n2 = 100X1 = 38. X2 = 40
So looking for the p value:
p = (38+ 40) / (100 + 100) = 0.39
z = (38/100 - 40/100)/√ (0.39*(1-0.39)*(1/100 + 1/100))= -0.2899
P-value = P (|z| > 0.2899) = 0.7718
7 0
3 years ago
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