answer.
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
Free_Kalibri [48]
2 years ago
11

Rachel measured the lengths of a random sample of 100 screws. The mean length was 2.9 inches, and the population standard deviat

ion is 0.1 inch. To see if the batch of screws has a significantly different mean length from 3 inches, what would the value of the z-test statistic be?
Mathematics
1 answer:
MaRussiya [10]2 years ago
8 0

Answer:

z = 10

Step-by-step explanation:

The value of the z-statistic is given by:

z = \frac{X - \mu}{s}

In which:

X is the measured value.

\mu is the expected value.

s = \frac{\sigma}{\sqrt{n}} is the standard deviation of the sample. \sigma is the standard deviation of the population.

In this question:

The mean length was 2.9 inches, and the population standard deviation is 0.1 inch.

This means that \mu = 2.9, \sigma = 0.1

Random sample of 100 screws.

This means that n = 100.

To see if the batch of screws has a significantly different mean length from 3 inches, what would the value of the z-test statistic be?

3 inches, so X = 3

s = \frac{0.1}{\sqrt{100}} = 0.01

z = \frac{X - \mu}{s}

z = \frac{3 - 2.9}{0.01}

z = 10

You might be interested in
If 40 percent of a movie ticket costs $5.00 what is 20 percent of the cost of two tickets
Nikolay [14]
<u>Find cost of a ticket:</u>

40% = $5.00

1% =  $5 ÷ 40 = 0.125

100% = 0.125 x 100 = $12.50

The cost of a ticket is $12.50


<u>Find 20% of two tickets:</u>

Two tickets cost $12.50 x 2 = $25

20% of $25 = 0.25 x $25 = $5

Answer: 20% of two tickets cost $5
8 0
2 years ago
3.4.4 Journal: Exponential vs. Quadratic
zysi [14]

Answer:

what's the question your asking for?


5 0
2 years ago
Aisha helps out at a petting zoo over the summer. She makes some changes where the animals are kept.
adoni [48]
I believe the awnser is A
3 0
2 years ago
What two positive real numbers whose product is 76 have the smallest possible​ sum?
Sloan [31]
,4 and 19

........................
3 0
2 years ago
Traffic data revealed that 35 percent of automobiles traveling along a portion of an interstate highway were exceeding the legal
bija089 [108]
This is a typo and vaguely phrased. However, the closest to a direct solution is to think of it as follows: 35% of the cars are speeding. Out of these, 52% of the cars are also speeding. Hence, the result of cars that are both speeding and speed cars is 0.52*0.35=0.182
3 0
2 years ago
Read 2 more answers
Other questions:
  • Emma conducted an experiment in which she rolled a six-sided, fair number cube 300 times. How many times would you predict she r
    12·3 answers
  • Generate a plan and describe the steps needed to solve the equation. <br><br> 34=-(m+3)
    5·2 answers
  • There are 500 employees in a firm, 45% are female. a sample of 60 employees is selected randomly. the probability that the sampl
    15·1 answer
  • A police officer had a taxable income of $47,050 last year. If she paid 10% of her income between $0 and $8350, 15% of her incom
    6·1 answer
  • If T is the midpoint of SU,find x. ( ST=8x+11 and TU= 12x-1)
    5·2 answers
  • Given: AD = BC and BCD = ADC <br> Prove: DE = CE
    13·2 answers
  • A small accounting firm has 4 accountants who each earn a different salary between 50,000 and 60,000 and a 5th accountant who wo
    11·1 answer
  • Which arrow would most likely represent the phase change that involves the same amount of energy as arrow 1?
    14·2 answers
  • For what values of h and k does the linear system have infinitely many solutions? 2x1 + 5x2 = −1 hx1 + kx2 = 7
    8·1 answer
  • How<br> How many solutions does the nonlinear system of equations graphed below<br> have?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!