Question

A random sample of 8 size AA batteries for toys yield a mean of 2.84 hours with standard deviation, 1.45 hours.

(a) Find the critical value, t*, for a 99% CI. t*

(b) Find the margin of error for a 99% CI

Answer #1

A random sample of 13 size AA batteries for toys yield a mean of
2.82 hours with standard deviation, 0.84 hours.
(a) Find the critical value, t*, for a 99% CI. t* =
(b) Find the margin of error for a 99% CI.

A random sample of 15 size AA batteries for toys yield a mean of
2.68 hours with standard deviation, 1.24 hours.
(a) Find the critical value, t*, for a 99% CI. t* =
(b) Find the margin of error for a 99% CI.

random sample of 19 size AA batteries for toys yield a mean of
3.45 hours with standard deviation, 1.23 hours.
(a) Find the critical value, ??, for a 99% CI. ?? =
(b) Find the margin of error for a 99% CI.

(1 point) A random sample of 20 size AA batteries for toys yield
a mean of 3.54 hours with standard deviation, 1.08 hours. (a) Find
the critical value, t*, for a 99% CI. t* = ______(b) Find the
margin of error for a 99% CI._____

A random sample of 14 size AA batteries for toys yield a mean of
3.23 hours with standard deviation, 0.54 hours. (a) Find the
critical value, t*, for a 99% CI (give to at least 3 decimal
places). t* =
(b) Find the margin of error for a 99% CI (give to at least 2
decimal places).

A random sample of 16 size AA batteries for toys yield a sample
mean of 2.72 hours with sample standard deviation 0.92 hours. Find
a 99% confidence interval for the mean hours of all AA
batteries.

6. Consumer report gave the following information about the life
(hour) size AA batteries in toys:, 3, 5, 7, 11, and 7,20(you need
to calculate mean and standard deviation first) a) Find mean and
Standard deviation b) Find 95% Confidence interval for life of the
batteries.

the mean life of a name brand aa battery is 19 hours. a consumer
group is interested in determining if generic aa batteries have a
shorter mean life. this group tested a random sample of 9 generic
AA batteries resulting in a mean life of 17.4 hours with a standard
deviation of 1.5 hours. you may assume that battery lives follow a
normal distribution. At 1% level of significance, do the generic AA
batteries have a mean life shorter than...

Power+, produces AA batteries used in remote-controlled toy
cars. The mean life of these batteries follows the normal
probability distribution with a mean of 18 hours and a standard
deviation of 5.4 hours. As a part of its testing program, Power+
tests samples of 25 batteries. Use Appendix B.1 for the
z-values.
a. What can you say about the shape of the
distribution of sample mean?
Shape of the distribution is
(Click to
select) Normal Uniform Binomial
b. What is the standard...

Power+, produces AA batteries used in remote-controlled toy
cars. The mean life of these batteries follows the normal
probability distribution with a mean of 22 hours and a standard
deviation of 5.6 hours. As a part of its testing program, Power+
tests samples of 25 batteries. Use Appendix B.1 for the
z-values.
a. What can you say about the shape of the
distribution of sample mean?
Shape of the distribution is
(Click to
select) Normal Uniform Binomial
b. What is the standard...

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