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wavy419
23.06.2020 •
Mathematics
A college student is interested in investigating the TV-watching habits of her classmates and surveys 20 people on the number of hours they watch per week. The results are provided below. Calculate the 80% confidence interval of the true average number of hours of TV watched per week.
P.S: excel formola needed only. For lower and Upper Bound
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Ответ:
80% confidence interval of the true average number of hours of TV watched per week is [8.28 hours, 11.02 hours].
Step-by-step explanation:
We are given that a college student is interested in investigating the TV-watching habits of her classmates and surveys 20 people on the number of hours they watch per week. The results are provided below;
Hours of TV per week (X): 6, 14, 13, 6, 16, 10, 19, 4, 5, 5, 18, 8, 7, 14, 8, 8, 9, 12, 6, 5.
Firstly, the Pivotal quantity for 80% confidence interval for the true average is given by;
P.Q. =
~ ![t_n_-_1](/tpl/images/0692/3265/5cbec.png)
where,
= sample mean number of hours of TV watched per week =
= 9.65
s = sample standard deviation =
= 4.61
n = sample of people = 20
Here for constructing 80% confidence interval we have used One-sample t-test statistics as we don't know about population standard deviation.
So, 80% confidence interval for the true average,
is ;
P(-1.33 <
< 1.33) = 0.80 {As the critical value of t at 19 degrees of
freedom are -1.33 & 1.33 with P = 10%}
P(-1.33 <
< 1.33) = 0.80
P(
<
<
) = 0.80
P(
<
<
) = 0.80
80% confidence interval for
= [
,
]
= [
,
]
= [8.28 hours, 11.02 hours]
Therefore, 80% confidence interval of the true average number of hours of TV watched per week is [8.28 hours, 11.02 hours].
Ответ:
calentar la jarra durante algunos minutos, llenándola de agua caliente.
calcular una cucharada llena (7-8 gramos) de café cada dos tazas de agua, cada una de 100-150 ml La dosis de café se puede regular según el gusto de cada uno.
poner en la máquina la cantidad correcta de agua y extraer.
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Step-by-step explanation: