Astudy claims that college students spend an average of 4 hours or less studying per day. a researcher wants to check if this claim is true. a random sample of 121 college students randomly selected and it showed that average of hours studying per day was 3.15 with a standard deviation of 1.2 hours. using the 10% significance level, can you conclude that the claim college students spend an average of 4 hours or less studying per day is valid?
1. h0 hypothesis: a. μ > 4 b. μ ≥ 4 c.μ ≤ 4 d. μ < 4
2. critical value: a. -1.28 b. 1.28 c. 1.645 d. -1.645
3. test statistics: a. -5.89 b. 5.89 c. -7.79 d. 7.79
4. comment: a: accept that college students spend an average of 4 hours or less studying per day
b: reject that college students spend an average of 4 hours or less studying per day

n = 121

x = 3.15

Since we are given that the claim  is college students spend an average of 4 hours or less studying per day is valid

Null hypothesis :

Alternate hypothesis:

1)  

Now we are given that significance level is 10%

So, confidence interval is 90%

Critical value at 90% is 1.645

2)Critical value : B : 1.645

Since n >30

So we will use z test

Now we are supped to calculate z statistics

Formula :

3)So,  Test statistics:  C. -7.79

Since the z value falls in the critical region

So, we reject the null hypothesis

So,  that college students spend an average of 4 hours or less studying per day

4) A: Accept that college students spend an average of 4 hours or less studying per day

the difference between a number and 5 is -2.

step-by-step explanation:

notice that the equation you are given has -2 (negative 2) on the right side, not 2. when you subtract 5 from a number n, you are finding the difference between the number and 5.

the difference between a number and 5 is -2.

steve should create a type of business report called a business plan. the correct option among the options that are already given in the question is the last or the fourth option. this business report created by steve will actually influence the investors about investing their money in steve's business. this business report will have all the details about the business, the amount of investment required and the amount of expected profit.