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
STALIN [3.7K]
3 years ago
9

A biologist studied the frequency of croaks for frogs from two different regions. From a random sample of 32 frogs located in th

e northern region, the mean number of croaks per hour was 21.3, and from a random sample of 38 frogs located in the southern region, the mean number of croaks per hour was 28.9. To estimate the difference in the mean number of croaks (southern minus northern), a 95 percent confidence interval was constructed from the samples. The interval was reported as (7.1, 8.1). Which of the following claims is supported by the interval?
A. All southern frogs croak more times per hour than do all northern frogs.
B. The northern frogs are likely to have a greater mean number of croaks per hour than the southern frogs.
C. The southern frogs are likely to have a greater mean number of croaks per hour than the northern frogs.
D. All frogs in the study have about the same number of croaks per hour.
E. The northern and southern frogs have the same mean number of croaks per hour.
Mathematics
1 answer:
ikadub [295]3 years ago
6 0

Answer:

C

Step-by-step explanation:

You might be interested in
The scissor lift is a device that can lower and raise a platform. the scissor lift can raise the platform at a rate of 2.0 inche
Svetradugi [14.3K]

Answer:

i thank it is 25 seconds.  

Step-by-step explanation:

3 0
3 years ago
Felix scored 52 and 64 on his first two test in Sociology 212. What must he get on the third test to get an average of the three
Pie

Answer:

Felix's third test score must be greater than 94

Step-by-step explanation:

Felix scores on Sociology 212 tests:

1st test - 52

2nd test - 64

3rd test - x

Find the average of Felix's scores:

\text{Average}=\dfrac{\text{The sum of all scores}}{\text{The total number of scores}}\\ \\\text{Average}=\dfrac{52+64+x}{3}

An average of the three test must be above 70, this means

\text{Average}>70\\ \\\dfrac{52+64+x}{3}>70

Solve this inequality. First, multiply it by 3:

52+64+x>210\\ \\x>210-52-64\\ \\x>94

4 0
3 years ago
If the volume is 18 density is 1.0 what is the mass
Leviafan [203]

Answer:

mass = 18 kg

Step-by-step explanation:

Formula:

mass = density * volume

mass = 1 * 18

mass = 18 kg

4 0
2 years ago
The equation V(t) = 12,000(0.75)^t represents the value of a motorcycle
user100 [1]

Answer:

(2) The motorcycle cost $12,000 when purchased.

Step-by-step explanation:

In the standard exponential equation, y = ab^x, a is the original value.

Since the equation is V(t) = 12,000(0.75)^t, a is 12,000.

This means that the original value was 12,000.

So, the motorcycle cost $12,000 when it was first purchased.

The correct answer is (2) The motorcycle cost $12,000 when purchased.

7 0
3 years ago
NEED HELP:
PSYCHO15rus [73]

Answer:

The radius is approx. 7.5

Let me know if it helps or if I got anything wrong!

Step-by-step explanation:

To find the circumference, you need to multiply the diameter by pi (3.14)

And for vice versa, just divide.

Since we don't know the diameter nor radius, we need to divide the Circumference (C) by pi (3.14)

47/3.14=14.968

Which is rounded up to 15.

We have now found the diameter.

We also know that the radius is half of the diameter

15/2=7.5

7 0
2 years ago
Other questions:
  • Circular fountain has 18cm base blueprints scale 3cm to 4 feet what is actual area of base after built
    6·1 answer
  • Ryan works at at the donut shop where he makes $10.25 per hour . He also works part time at the school bookstore where he makes
    11·1 answer
  • A figure skating school offers introductory lessons at $45 per session. There is also a registration fee of $65.
    6·2 answers
  • Thomas bikes at a rate of 24 mi in 3 h. Thomas’s friend De’Monte bikes 9.5 mi each hour. De’Monte and Thomas are 105 mi apart an
    9·1 answer
  • Simplify.
    15·1 answer
  • Sound intensity of certain Vacuum Cleaner is a random variable having a normal distribution with a mean of 75 dB and a standard
    5·1 answer
  • Which expression is equivalent to 4/9(2n - 3)
    14·1 answer
  • Tyra's family is spending the afternoon in Millersville. They plan to see a movie and then explore
    11·1 answer
  • More help lol gvbrhf
    7·1 answer
  • Angie babysits to earn extra spending money. She recorded how much money she earned
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!