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Contact [7]
2 years ago
15

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 6.8 parts

/million (ppm). A researcher believes that the current ozone level is at an insufficient level. The mean of 10 samples is 6.4 ppm with a standard deviation of 1.1. Does the data support the claim at the 0.05 level
Mathematics
1 answer:
Gnoma [55]2 years ago
5 0

Answer:

The test statistics fall in the critical region and hence null hypothesis is to be rejected.

Step-by-step explanation:

The null hypothesis : H0 : Mean = 6.80  

Alternative hypothesis: Ha: Mean is not equal to 6.80

As per the z statistics  

z = (x’-mean)/(sigma/sqrt n)

Substituting the given values, we get –  

z = 6.4-6.8/(1.1/sqrt 10)

z = -1.149

z test statistics is -1.149

Critical value for two tailed test at 98% confidence is .10749

The test statistics fall in the critical region and hence null hypothesis is to be rejected.

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A plumber charges a ​$70 flat rate for all home repairs. His hourly rate is​ $15 per half hour. How much would a 2 hour and 26 m
Gnesinka [82]

The plumber's 2 hour and 26 min plumbing bill​ cost is $73

What is the plumber's per minute rate?

The plumber's per minute rate is the per half-hour rate divided by 30 minutes since the plumber charges $15 for every 30-minute job

per-minute rate=$15/30

per-minute rate=$0.50

Now, let us convert 2hours and 26 minutes to minutes, in other words, every 1 hour is 60 minutes, the two hours equal 120 minutes plus the 26 minutes gives a total of 146 minutes

Total minutes=120 min+26 min

total minutes=146 minutes

Total plumbing bill cost for 146 minutes is $0.50, the per-minute rate multiplied by the number of minutes the plumber needs to work in this case

2 hour and 26 min plumbing bill​ cost=146*$0.50

2 hour and 26 min plumbing bill​ cost=$73

Find out more about hourly rate on:brainly.com/question/4468523

#SPJ1

4 0
2 years ago
How do you solve this and i have other questions like this one i really need to know how to do it
Natalija [7]

Answer:

25

Step-by-step explanation:

it's because 5 is squared so 5x5 is 25 and x squared

7 0
3 years ago
Which of the values will not make 3x-8>12 true. is it 12, 6, 11 or 7?
pishuonlain [190]
3 x 6 = 18
18-8= 10>12
8 0
3 years ago
Christopher wants to buy a notebook for $2.15, a pack of glue sticks for $5.08, and a pack of pens for $3.08. What is the total
ivanzaharov [21]

Answer:

10.31

Step-by-step explanation:

2.15+5.08+3.08= 10.31

4 0
3 years ago
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Answer:

2 and I do not play it.

Step-by-step explanation:

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3 years ago
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