1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
777dan777 [17]
3 years ago
11

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.1 parts

/million (ppm). A researcher believes that the current ozone level is not at a normal level. The mean of 26 samples is 6.6 ppm with a standard deviation of 1.0. Assume the population is normally distributed. A level of significance of 0.01 will be used. Find the value of the test statistic. Round your answer to three decimal places.
Mathematics
1 answer:
satela [25.4K]3 years ago
5 0

Answer:

t=\frac{6.6-7.1}{\frac{1.0}{\sqrt{26}}}=-2.550    

Step-by-step explanation:

Data given and notation  

\bar X=6.6 represent the sample mean

s=1.0 represent the sample standard deviation

n=26 sample size  

\mu_o =7.1 represent the value that we want to test

\alpha=0.01 represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is different from 7.1 ppm, the system of hypothesis would be:  

Null hypothesis:\mu = 7.1  

Alternative hypothesis:\mu \neq 7.1  

If we analyze the size for the sample is < 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic

We can replace in formula (1) the info given like this:  

t=\frac{6.6-7.1}{\frac{1.0}{\sqrt{26}}}=-2.550    

You might be interested in
Are 25 milligrams lighter or heavier than 25 centigrams
masya89 [10]

Answer:

<em>25 mg. is lighter than 25 cg.</em>

<em />

Step-by-step explanation:

<em>Well,</em>

<em />

<em>The prefix "milli" means thousandth and the prefix "centi" means hundredth.  So a milligram will be one-tenth of a centigram.</em>

<em />

<em>10 mg. = 1 cg.</em>

<em>25 mg. = 2.5 cg.</em>

<em />

<em>2.5 cg. < 25 cg.</em>

<em />

<em>25 mg. is lighter than 25 cg.</em>

8 0
3 years ago
Read 2 more answers
A jar contains 1,200 M&amp;M's and everyday your family eats 1/5th of the candies. After how many days will there be 314 M&amp;M
mrs_skeptik [129]
The equation is 314 = 1,200 - 240x

1,200 is the number of M&M's it starts with
The problem said the family eats 1/5th of the candy every day
1/5 of 1,200 is 240
It is a -240 because the amount of m&m's is getting fewer each day
The x stands for the number of days

Sorry but I'm not sure if I could answer your problem exactly
The answer is 3.69 days
Because there isn't an exact day that there would exactly 314 M&M's left

7 0
3 years ago
(12) Geographers use negative numbers to represent points below sea level and positive numbers for points above 1
myrzilka [38]

Difference in elevation is 6 meters.

5 0
3 years ago
Read 2 more answers
Can someone answer these pls
vazorg [7]

Answer:

x = -2

Step-by-step explanation:

hope this helps you

6 0
3 years ago
Read 2 more answers
A mathematical phrase containing at least one variable.
Nitella [24]
An expression is a mathematical phrase containing at least one variable :)
7 0
3 years ago
Other questions:
  • What are all of the factors of 23 and 126??? Please help with them and write them separate.
    13·1 answer
  • I really don't get how to do this can someone answer the half page for me?
    11·1 answer
  • Twice the first number is eleven more than the sum of the other two numbers. The sum of twice the first number and three times t
    14·1 answer
  • brian filled 80 glasses with apple juice for a school party. if each glass holds 1 cup of juice how many quarts of apple juice d
    5·2 answers
  • 2/7 • 9 1/10<br> Please help
    15·2 answers
  • 8) Find the x-intercepts: *
    7·1 answer
  • Write an equation to solve each problem and then solve it. a The sum of three consecutive integers is 84. Find the integers.
    12·1 answer
  • Find the equation of the line parallel to y = -3x + 4 with a y-intercept of -10
    8·2 answers
  • What comes after this:
    5·2 answers
  • If you spend $50,000 on new furniture and it is depreciating about 20% per year, how much will it be worth by its third year?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!