# statistics worksheet The critical z-value is calculated using Excel function

*label*Mathematics

*timer*Asked: Jan 3rd, 2018

*account_balance_wallet*$15

**Question description**

need help with a 10 question worksheet from my QNT/275 class. Some questions have multiple parts and there is plenty of time to have it completed. Can you please help me?

## Tutor Answer

Please find answer along with Excel Sheet.

Confidence Level

0.9

0.95

0.96

0.97

0.98

0.99

Critical z-value

1.64

1.96

2.05

2.17

2.33

2.58

Confidence Interval Estimate for the Mean

Data

Population Standard Deviation

Sample Mean

Sample Size

Confidence Level

Intermediate Calculations

Standard Error of the Mean

Z Value

Interval Half Width

Confidence Interval

Interval Lower Limit

Interval Upper Limit

4.8

48.25

81

95%

0.5333

-1.9600

1.05

47.20

49.30

Z Test of Hypothesis for the Mean

Data

Null Hypothesis

m=

Level of Significance

Population Standard Deviation

Sample Size

Sample Mean

Intermediate Calculations

Standard Error of the Mean

Z Test Statistic

Lower-Tail Test

Lower Critical Value

p -Value

Reject the null hypothesis

45

0.025

6

25

41.8

1.2000

-2.6667

-1.9600

0.0038

Z Test for Differences in Two Means

Data

Hypothesized Difference

Level of Significance

Population 1 Sample

Sample Size

Sample Mean

Population Standard Deviation

Population 2 Sample

Sample Size

Sample Mean

Population Standard Deviation

Intermediate Calculations

Difference in Sample Means

Standard Error of the Difference in Means

Critical z-value

Margin of error

0

0.01

18

7.82

2.35

15

5.99

3.17

1.83

0.9883

2.58

2.55

Lower Limit

-0.72

Upper Limit

4.38

Z Test for Differences in Two Means

Data

Hypothesized Difference

Level of Significance

Population 1 Sample

Sample Size

Sample ...

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