1)Graduating GPAs of Business major graduates at WSU have an unknown meanwith standard deviation=0.55.

A) A sample of 28 Business major graduates from WSU has a mean GPA of 3.7. Construct a 84 % confidence interval to estimate

Thecritical z-score,zc= (Round to 4 decimal places.)

The confidence interval is 3.7E, whereEis the margin of error. E= (Round to 2 decimal places.)

The interval in traditional format: ( , )

B) The sample of 28 Business major graduates from WSU giving a mean GPA of 3.7. Construct a 90 % confidence interval to estimate

Thecritical z-score,zc= (Round to 4 decimal places.)

The confidence interval is 3.7E, whereEis the margin of error.

E= (Round to 2 decimal places.)

The interval in traditional format:( , )

C) A sample of 124 Business major graduates from WSU also has a mean GPA of 3.7. Construct a 84 % confidence interval to estimate

Thecritical z-score,

zc= (Round to 4 decimal places.)

The confidence interval is 3.7E, whereEis the margin of error.

E= (Round to 2 decimal places.)

The interval in traditional format:( , )

D) A sample of 235 Business major graduates from WSU also has a mean GPA of 3.7. Construct a 90 % confidence interval to estimate

Thecritical z-score,

zc= (Round to 4 decimal places.)

The confidence interval is 3.7E, whereEis the margin of error.

E= (Round to 2 decimal places.)

The interval in traditional format:( , )

2)The population of Mosquito has an unknown mean lifespanwith standard deviation=0.55 days.

A) A sample of 24 mosquito has a mean lifespan of 8 days. Construct a 88 % confidence interval to estimate the mean lifespanof the mosquito population.

zc= (Round to 4 decimal places.)

The interval:8(RoundEto 2 decimal places)

The interval in traditional format:( , )

B) For the same sample of 24 mosquito with mean lifespan of 8 days, construct a 97 % confidence interval to estimate the mean lifespan

of the mosquito population.

zc= (Round to 4 decimal places.)

The interval:8 (RoundEto 2 decimal places)

The interval in traditional format:( , )

C) A sample of 254 mosquito also has a mean lifespan of 8 days. Construct a 88 % confidence interval to estimate the mean lifespan

of the mosquito population.

zc= (Round to 4 decimal places.)

The interval:8 (RoundEto 2 decimal places)

The interval in traditional format:( , )

D) A sample of 390 mosquito also has a mean lifespan of 8 days. Construct a 97 % confidence interval to estimate the mean lifespan

of the mosquito population.

zc= (Round to 4 decimal places.)

The interval:8(RoundEto 2 decimal places)

The interval in traditional format:( , )

3)A) Surveying a group of 33 home cooks who made cookies, a mean baking time of 2.25 hours is found. Assuming cooking times for cookies have standard deviation=0.25 hrs, construct a 97 % confidence interval to estimate the true mean baking timefor cookies.

zc= (Round to 4 decimal places.)

The interval: 2.25 (Round to 2 decimal places.)

The interval in traditional format:( , )

B) Surveying a group of 33 home cooks who made cookies, a mean baking time of 2 hours is found. Assuming cooking times for cookies have standard deviation=0.25 hrs, construct a 96 % confidence interval to estimate the true mean baking timefor cookies.

zc= (Round to 4 decimal places.)

The interval:2 (Round to 2 decimal places.)

The interval in traditional format:( , )

C) Surveying a group of 200 home cooks who made cookies, a mean baking time of 2.75 hours is found. Assuming cooking times for cookies have standard deviation=0.25 hrs, construct a 97 % confidence interval to estimate the true mean baking timefor cookies.

zc= (Round to 4 decimal places.)

The interval:2.75 (Round to 2 decimal places.)

The interval in traditional format:( , )

D) Surveying a group of 200 home cooks who made cookies, a mean baking time of 2.5 hours is found. Assuming cooking times for cookies have standard deviation=0.25 hrs, construct a 96 % confidence interval to estimate the true mean baking timefor cookies.

zc= (Round to 4 decimal places.)

The interval: 2.5 (Round to 2 decimal places.)

The interval in traditional format:( , )