Asimple random sample with n=54 provided a sample mean of 22.5 and a sample standard deviation of 4.4.

a. develop a 90% confidence interval for the population mean.

b. develop a 95% confidence interval for the population mean.

c. develop a 99% confidence interval for the population mean.

d. what happens to the margin of error and the confidence interval as the confidence level is increased?

When confidence level increases, margin of error increases thus making confidence interval wider.

Step-by-step explanation:

Given that a simple random sample with n=54 provided a sample mean of 22.5 and a sample standard deviation of 4.4.

Since n >30 but population std deviation is not known we can use only t critical value.

a) t critical = 2.006

Hence 90% confidence interval = Mean ±

=

b) t critical = 2.30687 = 2.31

Hence 90% confidence interval = Mean ±

=

c) t critical = 2.30687 = 2.31

Hence 90% confidence interval = Mean ±

=

d) When confidence level increases, margin of error increases thus making confidence interval wider.

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

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step-by-step explanation: