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
Verdich [7]
4 years ago
11

The Rocky Mountain district sales manager of Rath Publishing Inc., a college textbook publishing company, claims that the sales

representatives make an average of 40 sales calls per week on professors. Several reps say that this estimate is too low. To investigate, a random sample of 28 sales representatives reveals that the mean number of calls made last week was 42. The standard deviation of the sample is 2.1 calls. Using the 0.05 significance level, can we conclude that the mean number of calls per salesperson per week is more than 40?
Mathematics
1 answer:
podryga [215]4 years ago
4 0

Answer:

Yes, the mean number is more than 40

Step-by-step explanation:

The null hypothesis  

H0 = mean is 40

Let´s make the t test

t = (x – mean) / standard deviation / √sample size

t = (42 – 40) / 2.1 / √28

t = 5.039

now we find t value for one tail, using a T-distribution table

df = n – 1 = 27

α = 0.05

so, t = 1.703

since our calculated t value is greater than the t for the table, the null hypothesis can be rejected. So the mean number of calls per salesperson per week is more than 40.

 

You might be interested in
A garden hose is spraying a stream of water at a box on the ground with a force of 2.8 pounds. The water stream makes an angle o
Lorico [155]

Answer:

The horizontal component of force is 1.99 pounds.

Step-by-step explanation:

We are given the following in the question:

Force = 2.8 Newtons.

The attached image shows the arrangement.

Angle made by the water stream with the ground

\theta = 30^\circ

The horizontal component is given by:

|F|\cos \theta\\=2.3\cos(30)\\\\=2.3 \times \dfrac{\sqrt3}{2}\\\\=1.99

Thus, the horizontal component of force is 1.99 pounds.

6 0
4 years ago
Adding fractions with unlike Denominators and Subtracting fractions (PLEASE HELP ME ASAP AND PLEASE ANSWER ALL)
Colt1911 [192]

Answer:1.27,2.83,3.73.

Step-by-step explanation: 1.27 becuase when you add and subtract

6 0
2 years ago
Read 2 more answers
John is about to roll a six-sided, fair number cube 60 times. He wants to predict how many times the cube will land on an even n
GalinKa [24]
Even numbersso each dice has numbers1,2,3,4,5,6the eve numbers are2,4,6odd are others1,3,5so 1/2 are odd
therefor 1/2 of 60 is how many times it would get even1/2 of 60=1/2 times 60=30
No not good predicitionmy prediction would be 30 times
4 0
3 years ago
Read 3 more answers
Billy is on a weekend fishing trip with his scout troop. So far he has caught 4 trout and 10 catfish. What is the probability th
lara31 [8.8K]
We know that Billy caught total 4+10=14 fishes including trout and catfish.
P(catching the catfish):
10/14
Simplify that into 5/7. As a result, the probability that the next fish that Billy catches will be a catfish is 5/7. Hope it help!
6 0
4 years ago
K minus 10 over 2 = -7
Cerrena [4.2K]

Hey there!

k - 10/2 = -7

k - 5 = -7

ADD 5 to BOTH SIDES

k - 5 + 5 = -7 + 5

CANCEL out: -5 + 5 because that gives you 0

KEEP: -7 + 5 because it helps solve for the k-value

NEW EQUATION: k = -5 + 7

SIMPLIFY IT & YOU HAVE YOUR ANSWER!

k = -2

Therefore, your answer is: k = -2

Good luck on your assignment and enjoy your day!

~Amphitrite1040:)

3 0
3 years ago
Other questions:
  • What is 3x-2y when x=4 and why equals 2
    15·1 answer
  • Finding the area of a circle. please help.
    10·1 answer
  • Can you help me plz !!!!its science
    9·1 answer
  • if a line segment connects a point with its reflected image, explain the relationship between the line segment and the line of r
    9·1 answer
  • MZPQR = 56°. What is the measure of ZROQ?<br> a. 68°<br> b. 28°<br> c. 56°<br> d. 34°
    11·1 answer
  • Pls answer The total charge on 8 particles is −56 units. All the particles have the same charge.
    15·1 answer
  • Which number line represents the solutions to lx - 5| = 1?
    5·2 answers
  • If Jamar can run 3/5 of a mile in 2 minutes 30 seconds, what is his rate in miles per minute? (Remember, distance = rate x time)
    13·1 answer
  • Can someone help me ​
    7·1 answer
  • Question 3 2 pt Ella is building a chicken coop. The area of the chicken coop is 40 square feet. Each chicken needs at least 3 s
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!