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inessss [21]
3 years ago
12

The manager of the quality department for a tire manufacturing company wants to know the average tensile strength of rubber used

in making a certain brand of radial tire. She knows the population standard deviation and uses a Z test to test the null hypothesis that the mean tensile strength is 800 pounds per square inch. The calculated Z test statistic is a positive value that leads to a p-value of .047 for the test. If the significance level is .05, the null hypothesis would be rejected. Assume that the population of pressure values is normally distributed.
a) true
b) false
Mathematics
1 answer:
viktelen [127]3 years ago
8 0

Answer:

a) true

Step-by-step explanation:

Decision Rule

If;

P-value > significance level --- accept Null hypothesis

P-value < significance level --- reject Null hypothesis

Z score > Z(at 95% confidence interval) ---- reject Null hypothesis

Z score < Z(at 95% confidence interval) ------ accept Null hypothesis

For the case above, the p-value for the test is 0.047 which is less than the significance level 0.05

P-value < 0.05

Using the decision rule, we will reject the Null hypothesis which is the same as stated in the question, which means its true.

_Confirmed._

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A decorative steel is shown and it is made of a circular section and 6 stems. The length of each stem is 45cm Work out the lengt
Lelechka [254]

Answer: The required length of steel is 270 cm.

Step-by-step explanation:

Since we have given that

Number of stems = 6

Length of each stem = 45 cm

So, we need to find the length of steel used in the frame.

So, Length of steel = Number of stems × Length of each stem

So, the length of steel becomes

45\times 6\\\\=270\ cm

Hence, the required length of steel is 270 cm.

6 0
3 years ago
Sam found $1.8 After finding the money in his pocket, Sekou finds an additional $0.75 in his backpack. Then he decides to buy a
Kitty [74]

Answer:

Hey there!

Sam's Money=1.80 dollars + 0.75 dollars.

1.80+0.75-1.50=1.05

1.05/0.13= 8.08.

He will be able to buy 8 pieces of gum.

Let me know if this helps :)

7 0
3 years ago
In the equation below a is a number between 0 and 1 8 x a = b which statement about the value of b is always true
Kamila [148]

Answer:

See Explanation

Step-by-step explanation:

Given

0 \le a \le 1

8*a =b

Required

Determine the true statement about b

The question is incomplete as options are not given. However, a general explanation is as follows:

Rewrite 8*a =b

b = 8 * a

When a = 0

b = 8 * 0 = 0

When a = 1

b = 8 * 1 = 8

This means that:

For 0 \le a \le 1

Then 0 \le b \le 8

<em>This means that: b is a number between 0 and 8</em>

3 0
3 years ago
Solve this system of linear equations. Separate the x- and y-values with a comma. -3x=42-16y 14x=76-16y
myrzilka [38]

Answer:

(2,3)

Step-by-step explanation:

The given equations are:

1st: -3x=42-16y

2nd: 14x=76-16y

Subtract the first equation from the second one:

14x--3x=76-42-16y--16y

14x+3x=34-16y+16y

17x=34

x=\frac{34}{17}=2

We plug in x-value into the second equation to get:

14(2)=76-16y

14x=76-32

28-76=-16y

-48=-16y

Divide both sides by -16

y=3

5 0
3 years ago
Use the roster method to write the given set the set of integers x that satisfy 2x-1= -13
anygoal [31]

The only set of elements that satisfied the equation 2x-1= -13 is {-6}.

<h3>What is a set?</h3>

A set is a combination of specific quantities in which the meaning of each variable must be the same.

For example {1,2,3,4,5,6...} is a set of natural numbers in which each variable is representing a natural number so the overall meaning is the same among all.

Another example could be a set of whole numbers like that.

Given the equation,

2x-1= -13

By taking -1 right-hand side

2x = -13 + 1 = -12

By dividing 2

x = -6

Hence "The only set of elements that satisfied the equation 2x-1= -13 is {-6}".

To learn more about the sets,

brainly.com/question/8053622

#SPJ4

6 0
1 year ago
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