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Brrunno [24]
2 years ago
14

Please help me asap

Mathematics
1 answer:
salantis [7]2 years ago
3 0

Answer:

D

Step-by-step explanation:

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Laura works at a coffee shop. Her boss has asked that she write down how many minutes each of the next 10 orders take to make. H
ASHA 777 [7]

Answer:

4

Step-by-step explanation:

6+2+4+2+2+7+5+6+3+3=40

40/10=4

Therefore the mean is 4

8 0
2 years ago
the standard deviation of 100 random samples of the same size is approximated to be 0.98. what is the margin of error​
pogonyaev

Answer:

MOE= ± 0.098

Step-by-step explanation:

-The margin of error is calculated using the formula:

MOE=\pm \frac{\sigma}{\sqrt{n}}

#Substitute to solve for MOE:

MOE=\pm \frac{\sigma}{\sqrt{n}}\\\\=\frac{0.98}{\sqrt{100}}\\\\=\pm 0.098

Hence, the margin of error is ± 0.098

3 0
2 years ago
18 men take 15 days to dig 6 hactares of land. find how many men are required to dig 8 hactares in 12 days
dezoksy [38]
30, it’ll take 30 men to dig 8 hactares in 12 days.
3 0
1 year ago
Problem 2: For a recent year, the mean fare to fly from Charlotte, North Carolina to Chicago Illinois, on a discount ticket was
Maru [420]

Answer:

Step-by-step explanation:

n = 12

The mean of the set of data given is

Mean, x = (286 + 290 + 285 + 291 + 287 + 275 + 262 + 289 + 274 + 276 + 297 + 262)/12 = 281.2

Standard deviation = √(summation(x - mean)²/n

Summation(x - mean)² = (286 - 281.2)^2 + (290 - 281.2)^2 + (285 - 281.2)^2 + (291 - 281.2)^2 + (287 - 281.2)^2 + (275 - 281.2)^2 + (262 - 281.2)^2 + (289 - 281.2)^2 + (274 - 281.2)^2 + (276 - 281.2)^2 + (297 - 281.2)^2 + (262 - 281.2)^2 = 1409.68

Standard deviation, s = √(1409.68/12) = 10.8

We would set up the hypothesis test. This is a test of a single population mean since we are dealing with mean

1) For the null hypothesis,

H0: µ = 290

For the alternative hypothesis,

H1: µ < 290

This is a left tailed test.

2) Since the number of samples is small and no population standard deviation is given, the distribution is a student's t.

Since n = 12,

Degrees of freedom, df = n - 1 = 12 - 1 = 11

t = (x - µ)/(s/√n)

Where

x = sample mean = 281.2

µ = population mean = 290

s = samples standard deviation = 10.8

t = (281.2 - 290)/(10.8/√12) = - 2.82

Test statistic = - 2.82

3) The decision rule is to reject the null hypothesis if the significance level is greater than the p value.

4) We would determine the p value using the t test calculator. It becomes

p value = 0.0083

5) Since alpha, 0.01 > than the p value, 0.0083, then we would reject the null hypothesis. Therefore, At a 1% level of significance, the sample data showed significant evidence that the mean fare has decreased.

3 0
3 years ago
Which of the following is a characteristic of a plane? does not have thickness is not visible does not have any physical propert
Dahasolnce [82]

D.) All of the above

3 0
3 years ago
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