1. the term is known as Group of answer choices the level of confidence plus one the level of significance the level of

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1. the term is known as
Group of answer choices
the level of confidence plus one
the level of significance
the level of confidence
the level of confidence minus one
2. Suppose that a random sample of 40 bottles of a particular bottle of cough medicine is selected and the alcohol content of each bottle is measured. The sample mean alcohol content is 8.6 ml with a population standard deviation of 2.88 ml. What is the point estimate of population mean?
Group of answer choices
8.6 l
8.6 ml
4.0 ml
2.88 ml
3. Suppose that a random sample of 40 bottles of a particular bottle of cough medicine is selected and the alcohol content of each bottle is measured. The sample mean alcohol content is 8.6 ml with a population standard deviation of 2.88 ml. If you calculate a 99% confidence interval for the true mean alcohol content for the population of all bottles of the brand under study, what is the estimator for this particular problem?
Group of answer choices
sample mean
sample standard deviation
population mean
population standard deviation
4. Suppose that a random sample of 40 bottles of a particular bottle of cough medicine is selected and the alcohol content of each bottle is measured. The sample mean alcohol content is 8.6 ml with a population standard deviation of 2.88 ml. If you calculate a 99% confidence interval for the true mean alcohol content for the population of all bottles of the brand under study, what is the estimator for this particular problem?
Group of answer choices
sample mean
sample standard deviation
population mean
population standard deviation
5. The value that we add and substract from the point estimate is known as
Group of answer choices
all of the answers are correct
E
maximum error of margin
margin of error
6. The width of a confidence interval can be manipulated by
Group of answer choices
changing population standard deviation
none of the answers are correct
changing the sample size
sample standard deviation
7. If sample size is large and population standard deviation is not known, which distribution do we use?
Group of answer choices
all of the answers are correct
binomial distribution
t distribution
z distribution
8. Sixty-nine randomly selected adults who buy books for general reading were asked how much they usually spend on books per year. The sample produced a mean of $1450 and a standard deviation of $300 for such annual expenses.
In the above problem to construct a 99% confidence interval, what would be df?
Group of answer choices
300
68
1450
69
Please answer all the question its all multiple choices