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MrMuchimi
3 years ago
15

Use your graphing calculator to determine the necessary t value for a 95% confidence interval based on a sample size of 55 and s

ample standard deviation of 7.42.
HELP PLS!
Mathematics
1 answer:
Paladinen [302]3 years ago
8 0

Answer:

The t-value is 2.0049.

Step-by-step explanation:

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 55 - 1 = 54

Now, we have to find a value of T, which is found looking at the t table, with 54 degrees of freedom(y-axis) and a confidence level of 0.95(t_{95}). So we have T = 2.0049

The t-value is 2.0049.

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Answer: he invested $200 at 10%, $400 at 11% and $600 at 12%

Step-by-step explanation:

Let x represent the amount invested in the account earning 10% interest.

Let y represent the amount invested in the account earning 11% interest.

Let z represent the amount invested in the account earning 12% interest.

If she has twice as much money invested at 11 % as she does in 10 %, it means that

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If she has three times as much at

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