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
irina1246 [14]
3 years ago
12

A particular species of salmon has an average weight of 57 lb, with a standard deviation of 6.3 lbs. Researchers studying salmon

in a particular river find that in a sample of 45 fish, average weight is 60.2 lbs. What should researchers do?
a. Reject the null hypothesis; these fish are not larger than usual

b. Do not reject the null hypothesis; these fish are larger than usual

c. Do not reject the null hypothesis; these fish are not larger than usual

d. Reject the null hypothesis; these fish are larger than usual​
Mathematics
1 answer:
atroni [7]3 years ago
3 0

Step-by-step explanation:

Given:

population mean, mu = 57 lb

population standard deviation, sigma = 6.3 lb

Sample mean, x = 60.2 lb

Sample size, n= 45

Null hypothesis x = mu  (i.e. sample mean is not greater than usual, using a significance level of 0.05)

Here we have a case where population mean and standard deviation are known (given).

We calculate the z-score

z=(x-mu)/(sigma/sqrt(n))  

= (60.2-57)/(6.3/sqrt(45))

= 3.41

P(x>mu) = P(z>3.41) = 0.99968  >> 0.95  (one sided tail)

Therefore we can reject the null hypothesis and accept the alternate hypothesis that fish are larger than usual.

You might be interested in
If it is 9:26, what time will it be in 54 minutes?
Nata [24]

Answer:

In 54 minutes, it'll be 10:30.

6 0
3 years ago
What value of a makes the equation true? 1.7a+0.3a=4/5 A) a=2/5 B) a=−1 1/5 C) a=2 4/5 D) a=1 3/5
7nadin3 [17]
First you want to collect the like terms, 2a=45 , then divide both sides of the equation by 2 which is a=2/5 , or a=0.4
6 0
3 years ago
Read 2 more answers
Lisa is 10 cm taller than her friend ian. Ian is 14 cm taller than jim. Every month, their heights increase by 2 cm. In 7 months
koban [17]

Answer:  Ian's height = x+14 = 69+14 = 83 cm

Explanation :

Let the height of Jim be x

Let the  height of Ian be x+4

Let the height of Lisa be x+4+10=x+14

Since their heights increase by 2cm every months

so after 7 months ,

Jim's  height = x+14

Ian's  height= x+4+14=x+18

Lisa's  height= x+14+14=x+28

According to question,

Sum of Ian's and Jim's height = 170cm

x+18+x+14 = 170\\2x+32 =170\\2x =170-32\\2x = 138

⇒x = \frac{138}{2}

⇒ x= 69cm

∴ Ian's height = x+14 = 69+14 = 83 cm

5 0
3 years ago
Read 2 more answers
Which of the following are abiotic factors in an ecosystem? (select all)
borishaifa [10]
Water. ••• All living organism needs some water intake.
6 0
2 years ago
How do you write in numbers a hundred and one thousand dollars?
mixas84 [53]
You write it as $101,000.
8 0
3 years ago
Other questions:
  • I need to know the explanation on how to find the answer to #21. On the text book answer key it states that the answer is ons ca
    14·1 answer
  • -2x + 7<br> Coefficient(s) :<br> Variables(s):<br> Constant:
    7·1 answer
  • Tom is afraid of heights above 9 feet. He is asked to repair a side of a high deck. The bottom of a ladder must be placed 6 feet
    11·2 answers
  • Researchers from Dartmouth Medical School conducted a study in 2003 to look at the connection between watching actors smoking in
    9·1 answer
  • Tim bought five new baseball trading cards to add to his collection. The next
    9·2 answers
  • Rachel ordered a pizza for $21 and a soda for $3.29.If she hands the cashier $25, how much change will she get back
    11·2 answers
  • A Nike jacket has a regular price of $64. You have a coupon for 15% off.
    6·2 answers
  • PLZZ HELPP ILL GIVE BRAINLIST
    7·2 answers
  • I dont understand this​
    12·1 answer
  • I need help with percentages
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!