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aliina [53]
2 years ago
9

At the sports awards ceremony,5 members of the soccer team and 8 members of the softball team won awards. What was the ratio of

the softball team members to award winners?
Mathematics
1 answer:
Dima020 [189]2 years ago
8 0

Answer:

8:13 or 8/13 or 62%

Step-by-step explanation:

When comparing two things make sure to put what the question says first, first.  Add the number of soccer and softball players that got awards to find the total number of award winners.

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The home run percentage is the number of home runs per 100 times at bat. A random sample of 43 professional baseball players gav
Andru [333]

Step-by-step explanation:

(a) Yes, if you enter all 43 values into your calculator, you calculator should report:

xbar = 2.293

s = 1.401

(b)

Note: Most professors say that is sigma = the population standard deviation is unknown (as it is unknown here), you should construct a t-confidence interval.

xbar +/- t * s / sqrt(n)

2.293 - 1.684 * 1.401 / sqrt(43) = 1.933

2.293 - 1.684 * 1.401 / sqrt(43) = 2.653

Answer: (1.933, 2.653)

Note: To find the t-value that allows us to be 90% confident, go across from df = 43-1 = 42 (round down to 40 to be conservative since 42 in not in the table) and down from (1-.90)/2 = .05 or up from 90% depending on your t-table. So, the t-critical value is 1.684.

Note: If you can use the TI-83/84, it will construct the following CI using df = 42 (ie t = 1.681).

2.293 +/- 1.681 * 1.401 / sqrt(43)

(1.934, 2.652)

Note: Some professors want you to construct a z-CI when the sample size is large. If your professor says this, the correct 90% CI is:

2.293 +/- 1.645 * 1.401 / sqrt(43)

(1.942, 2.644)

Note: To find the z-value that allows us to be 90% confident, (1) using the z-table, look up (1-.90)/2 = .05 inside the z-table, or (2) using the t-table, go across from infinity df (= z-values) and down from .05 or up from 90% depending on your t-table. Either way, the z-critical value is 1.645.

(c)

Note: Again, most professors say that is sigma = the population standard deviation is unknown (as it is unknown here), you should construct a t-confidence interval.

xbar +/- t * s / sqrt(n)

2.293 - 2.704 * 1.401 / sqrt(43) = 1.715

2.293 - 2.704 * 1.401 / sqrt(43) = 2.871

Answer: (1.715, 2.871)

Note: To find the t-value that allows us to be 99% confident, go across from df = 43-1 = 42 (round down to 40 to be conservative since 42 in not in the table) and down from (1-.99)/2 = .005 or up from 99% depending on your t-table. So, the t-critical value is 2.704.

Note: If you can use the TI-83/84, it will construct the following CI using df = 42 (ie t = 2.698).

2.293 +/- 2.698 * 1.401 / sqrt(43)

(1.717, 2.869)

Note: Again, some professors want you to construct a z-CI when the sample size is large. If your professor says this, the correct 99% CI is:

2.293 +/- 2.576 * 1.401 / sqrt(43)

(1.742, 2.843)

Note: To find the z-value that allows us to be 99% confident, (1) using the z-table, look up (1-.99)/2 = .005 inside the z-table, or (2) using the t-table, go across from infinity df (= z-values) and down from .005 or up from 99% depending on your t-table. Either way, the z-critical value is 2.576.

(d)

Tim Huelett 2.5

Since 2.5 falls between (1.715, 2.871), we see that Tim Huelett falls in the 99% CI range. So, his home run percentage is NOT significantly different than the population average.

Herb Hunter 2.0

Since 2.0 falls between (1.715, 2.871), we see that Herb Hunter falls in the 99% CI range. So, his home run percentage is NOT significantly different than the population average.

Jackie Jensen 3.8.

Since 3.8 falls above (1.715, 2.871), we see that Jackie Jensen falls in the 99% CI range. So, his home run percentage IS significantly GREATER than the population average.

(e)

Because of the Central Limit Theorem (CLT), since our sample size is large, we do NOT have to make the normality assumption since the CLT tells us that the sampling distribution of xbar will be approximatley normal even if the underlying population distribution is not.

6 0
3 years ago
Solve each equation.<br> 3) 4= 2x + 3.x
Andrej [43]

Answer:

Step-by-step explanation:

2x+3x=4

5x=4

x=4/5

6 0
2 years ago
Read 2 more answers
10 - 3 (z - 2) = 5z + 7
Alla [95]

Answer:

= 9/8

That's the answer

7 0
3 years ago
Read 2 more answers
Solve the inequality. Graph the solution on a number line. 7 ≥ t/-2
Elodia [21]

t\geq -14

The graph is shown in the figure attached.

Step-by-step explanation:

We need to solve the inequality 7\geq \frac{t}{-2} and graph the solution.

Solving the inequality: 7\geq \frac{t}{-2}

Switch sides and reverse the inequality:

\frac{t}{-2}\leq 7

Multiplying both sides by -2 and reverse the inequality

-2\frac{t}{-2}\geq 7*-2

t\geq -14

The graph is shown in the figure attached.

Keywords: Graph the inequality

Learn more about Graph the inequality at:

  • brainly.com/question/1626676
  • brainly.com/question/2840217
  • brainly.com/question/6703816

#learnwithBrainly

7 0
2 years ago
Luis, Marrisa, and Federico are rasing money for a school field trip. Luis had raised 6/7 of the total amount needed, Marrisa ha
Margaret [11]
Luis = 6/7
Marrisa = 5/9
Federico = 11/10 = 1 1/10

Greatest fraction = 1 1/10

Answer: Frederico raised the most. 
7 0
3 years ago
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