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
evablogger [386]
3 years ago
14

A sample of 75 information systems managers had an average hourly income of $40.75 with a standard deviation of $7.00. The 95% c

onfidence interval for the average hourly wage (in $) of all information system managers is
a. 37.54 to 43.96.
b. 38.61 to 42.89.
c. 39.14 to 42.36.
d. 39.40 to 42.10.
Mathematics
1 answer:
IrinaVladis [17]3 years ago
6 0

Answer: c. 39.14 to 42.36

Step-by-step explanation:

We want to determine a 95% confidence interval for the average hourly wage (in $) of all information system managers

Number of sample, n = 75

Mean, u = $40.75

Standard deviation, s = $7.00

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean +/- z ×standard deviation/√n

It becomes

40.75 +/- 1.96 × 7/√75

= 40.75 ± 1.96 × 0.82

= 40.75 + 1.6072

The lower end of the confidence interval is 40.75 - 1.6072 =39.14

The upper end of the confidence interval is 40.75 + 1.6072 =42.36

You might be interested in
Discuss and explain why sampling permits us to make inferences about populations.
GREYUIT [131]

The end result of sampling is to get a representative sample, or a small collection of units or cases from a much larger collection or population. In theory, the researcher can study the smaller group and produce accurate generalizations about the larger group. Researchers focus on the specific techniques that will yield highly representative samples much so in similarities as a population. Quantitative researchers tend to use a type of sampling based on theories of probability from mathematics, called probability sampling.Sampling is the group of individuals who participate in your study. These are the individuals who will participate in a qualitative study. People who could have been participants in your study but did not actually participate are not considered part of your sample.

6 0
3 years ago
Length 21cm area 315cm2 find the breath ​
Ronch [10]

Answer:

Breadth = 15 cm

Step-by-step explanation:

Area = length x breadth

315 = 21 x breadth

\frac{315}{21} = \frac{21}{21} \times breadth                 [ dividing both sides by 21 ]

15 = 1 \times breadth\\\\breadth = 15 \ cm

4 0
3 years ago
Read 2 more answers
Help asap pls!!! Put steps if possible 3
GarryVolchara [31]

Answer:

i. 15.4

ii.45.2

Step-by-step explanation:

correct me if im wrong

tnx

8 0
2 years ago
Need help with part c
Artyom0805 [142]
First understand that this is a linear graph. Find 2 points on the graph. We can use (0,1) and (3,-3).

Look at how much the x increases, in this case the x value increases by 0+3, so 3.

Then see how much the y value increases (make sure to evaluate them in the same order) 1 + (-3) = -2.

So you know that the y value decreases by 2 units for every 3 unit increase in x. Therefore the slope is y=(-2/3)x

Then figure out what you add to the end. The y intercept is (0,1), so add 1 to the end of y=(-2/3)x to move it up.

Your resulting eq is y=(-2/3)x+1
8 0
3 years ago
What is 3/4b>15 solution
Orlov [11]

Answer:

b>20

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • Teloria, Maria, and Britt each ordered a pizza. Teloria ate
    12·2 answers
  • What is the mean, median, and mode of 3,8,13,4,9,15,7,8,5,
    6·2 answers
  • Enter the number that makes the equation true.<br> 3.15+0.6=?
    7·2 answers
  • If the diameter of a circle with a circumference of 12.6 mm is divided by 2, what is the circumference of the new circle?
    15·2 answers
  • Help thanksssssssssssss
    7·2 answers
  • No dia 15/05/2020 as 18h e 40min o G1 divulgou que a Paraíba tem 3.739 casos confirmados e 170 mortes por coronavírus. Qual a po
    7·1 answer
  • 1. A spinner has 5 equal sectors numbered 1 through 5. What is the probability that the result of a spin will be an odd number?
    9·1 answer
  • 208 rounded to the hundreds place
    11·1 answer
  • An angle measures 90º more than the measure of its supplementary angle. What is the measure of each angle?
    10·2 answers
  • Area of triangle please help
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!