find a 99% confidence interval given ∑i=161 X_i = 6450 and ∑i=161 X^2_i = 6450
find a 99% confidence interval for the mean given:
∑i=161 X_i = 6450
and
∑i=161 X^2_i = 6450
I found the sample mean of 105.7377 . (6450/61)
I do not know how to find the variance. Then confidence interval is computable.
statistics variance confidence-interval
asked Nov 19 '18 at 2:03
kmediate
115
add a comment |
find a 99% confidence interval for the mean given:
∑i=161 X_i = 6450
and
∑i=161 X^2_i = 6450
I found the sample mean of 105.7377 . (6450/61)
I do not know how to find the variance. Then confidence interval is computable.
statistics variance confidence-interval
asked Nov 19 '18 at 2:03
kmediate
115
We use a form of $LaTeX$ here called MathJax. It works in the title section too.
– Shaun
Nov 19 '18 at 2:16
add a comment |
find a 99% confidence interval for the mean given:
∑i=161 X_i = 6450
and
∑i=161 X^2_i = 6450
I found the sample mean of 105.7377 . (6450/61)
I do not know how to find the variance. Then confidence interval is computable.
statistics variance confidence-interval
asked Nov 19 '18 at 2:03
kmediate
115
find a 99% confidence interval for the mean given:
∑i=161 X_i = 6450
and
∑i=161 X^2_i = 6450
I found the sample mean of 105.7377 . (6450/61)
I do not know how to find the variance. Then confidence interval is computable.
statistics variance confidence-interval
statistics variance confidence-interval
asked Nov 19 '18 at 2:03
kmediate
115
asked Nov 19 '18 at 2:03
kmediate
115
edited Nov 19 '18 at 2:25
asked Nov 19 '18 at 2:03
kmediate
115
asked Nov 19 '18 at 2:03
kmediate
115
asked Nov 19 '18 at 2:03
kmediate
115
115
We use a form of $LaTeX$ here called MathJax. It works in the title section too.
– Shaun
Nov 19 '18 at 2:16
add a comment |
We use a form of $LaTeX$ here called MathJax. It works in the title section too.
– Shaun
Nov 19 '18 at 2:16
We use a form of $LaTeX$ here called MathJax. It works in the title section too.
– Shaun
Nov 19 '18 at 2:16
We use a form of $LaTeX$ here called MathJax. It works in the title section too.
– Shaun
Nov 19 '18 at 2:16
add a comment |
1 Answer
1
active
oldest
votes
CI for mean or which? You can use those formulas to find the sample variance too.
$s^{2}= frac{sum_{i=0}^n x^{2}_{i} - (sum_{i=0}^n x_{i})^{2}/n}{n-1} $
If for mean you will use a T-interval
$(bar{x} - t_{alpha/2,df}{frac{s}{sqrt{n}}},bar{x} + t_{alpha/2,df}{frac{s}{sqrt{n}}}) $
where df=n-1
answered Nov 19 '18 at 2:23
pfmr1995
93
yes, for the mean
– kmediate
Nov 19 '18 at 2:25
if you are allowed to use a graphing calculator a ti-84 can do it
– pfmr1995
Nov 19 '18 at 2:28
add a comment |
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1 Answer
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1 Answer
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CI for mean or which? You can use those formulas to find the sample variance too.
$s^{2}= frac{sum_{i=0}^n x^{2}_{i} - (sum_{i=0}^n x_{i})^{2}/n}{n-1} $
If for mean you will use a T-interval
$(bar{x} - t_{alpha/2,df}{frac{s}{sqrt{n}}},bar{x} + t_{alpha/2,df}{frac{s}{sqrt{n}}}) $
where df=n-1
answered Nov 19 '18 at 2:23
pfmr1995
93
yes, for the mean
– kmediate
Nov 19 '18 at 2:25
if you are allowed to use a graphing calculator a ti-84 can do it
– pfmr1995
Nov 19 '18 at 2:28
add a comment |
CI for mean or which? You can use those formulas to find the sample variance too.
$s^{2}= frac{sum_{i=0}^n x^{2}_{i} - (sum_{i=0}^n x_{i})^{2}/n}{n-1} $
If for mean you will use a T-interval
$(bar{x} - t_{alpha/2,df}{frac{s}{sqrt{n}}},bar{x} + t_{alpha/2,df}{frac{s}{sqrt{n}}}) $
where df=n-1
answered Nov 19 '18 at 2:23
pfmr1995
93
yes, for the mean
– kmediate
Nov 19 '18 at 2:25
if you are allowed to use a graphing calculator a ti-84 can do it
– pfmr1995
Nov 19 '18 at 2:28
add a comment |
CI for mean or which? You can use those formulas to find the sample variance too.
$s^{2}= frac{sum_{i=0}^n x^{2}_{i} - (sum_{i=0}^n x_{i})^{2}/n}{n-1} $
If for mean you will use a T-interval
$(bar{x} - t_{alpha/2,df}{frac{s}{sqrt{n}}},bar{x} + t_{alpha/2,df}{frac{s}{sqrt{n}}}) $
where df=n-1
answered Nov 19 '18 at 2:23
pfmr1995
93
CI for mean or which? You can use those formulas to find the sample variance too.
$s^{2}= frac{sum_{i=0}^n x^{2}_{i} - (sum_{i=0}^n x_{i})^{2}/n}{n-1} $
If for mean you will use a T-interval
$(bar{x} - t_{alpha/2,df}{frac{s}{sqrt{n}}},bar{x} + t_{alpha/2,df}{frac{s}{sqrt{n}}}) $
where df=n-1
answered Nov 19 '18 at 2:23
pfmr1995
93
edited Nov 19 '18 at 2:27
answered Nov 19 '18 at 2:23
pfmr1995
93
answered Nov 19 '18 at 2:23
pfmr1995
93
answered Nov 19 '18 at 2:23
pfmr1995
93
93
yes, for the mean
– kmediate
Nov 19 '18 at 2:25
if you are allowed to use a graphing calculator a ti-84 can do it
– pfmr1995
Nov 19 '18 at 2:28
add a comment |
yes, for the mean
– kmediate
Nov 19 '18 at 2:25
if you are allowed to use a graphing calculator a ti-84 can do it
– pfmr1995
Nov 19 '18 at 2:28
yes, for the mean
– kmediate
Nov 19 '18 at 2:25
yes, for the mean
– kmediate
Nov 19 '18 at 2:25
if you are allowed to use a graphing calculator a ti-84 can do it
– pfmr1995
Nov 19 '18 at 2:28
if you are allowed to use a graphing calculator a ti-84 can do it
– pfmr1995
Nov 19 '18 at 2:28
add a comment |
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We use a form of $LaTeX$ here called MathJax. It works in the title section too.
– Shaun
Nov 19 '18 at 2:16