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liq [111]
4 years ago
14

For the following​ claim, find the null and alternative​ hypotheses, test​ statistic, critical​ value, and draw a conclusion. As

sume that a simple random sample has been selected from a normally distributed population. Answer parts ​a-d. ​Claim: The mean IQ score of statistics professors is greater than 121. Sample​ data: nequals13​, x overbarequals122​, sequals13. The significance level is alphaequals0.05.
Mathematics
1 answer:
babunello [35]4 years ago
3 0

Answer:

Step-by-step explanation:

Given that for a sample of size n = 13, mean =122 and std dev = 13

STd error of sample = \frac{13}{\sqrt{13} } =3.61

Hypotheses:

H_0: x bar = 121\\H_a: x bar >121

(One tailed test at 5% sign level)

Mean difference = 1 and test statistic

t = \frac{1}{3.61} \\=0.2778

df = n-1 =12

pvalue = 0.3929

Since p > alpha, accept null hypothesis

There is no evidence to prove that mean is greater than 121.

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Answer:

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Since finance charges is the way of charging us by the credit card issuing authority for carrying a balance on our credit card and not paying it off completely at the end of each month.

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3 0
4 years ago
Read 2 more answers
5x + 2 + 3x + 5 = ?
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3 years ago
Complete parts ​(a) through ​(c) below.
nexus9112 [7]

Answer:

a) t_{crit}=1.34

b) t_{crit}=-1.33

c) t_{crit}=\pm 2.11

Step-by-step explanation:

Part a

\alpha=0.1 represent the significance level

df =15

Since is a right tailed test the critical value is given by:

t_{crit}=1.34

And we can use the following excel code to find it: "=T.INV(0.9,15)"

Part b

\alpha=0.1 represent the significance level

n=20 represent the sample size

First we need to find the degrees of freedom given by:

df=n-1=20-1=19

Since is a left tailed test the critical value is given by:

t_{crit}=-1.33

And we can use the following excel code to find it: "=T.INV(0.1,19)"

Part c

\alpha=0.05 represent the significance level

n=18 represent the sample size

First we need to find the degrees of freedom given by:

df=n-1=18-1=17

The value of \alpha=0.05 and \alpha/2 =0.025

Since is a two tailed tailed we have two critical values is given by:

t_{crit}=\pm 2.11

And we can use the following excel code to find it: "=T.INV(0.025,17)"

4 0
3 years ago
What is the answer to this?
Ray Of Light [21]

Answer:

s = -18

b is correct option

Step-by-step explanation:

\frac{4}{s} =\frac{-2}{9}

By cross multiplication

4×9 = -2×s

0r

-2×s = 4×9

s = 36 ÷ -2

s = -18

8 0
3 years ago
NEED ANSWER QUICK!!
dybincka [34]

Answer:

$192

Step-by-step explanation:

2400/48=50

50x3.84=192

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3 years ago
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