Question: 3) Instruction: DO NOT use the T-table, use the invt( ) program available in your calculator to calculate the t-value. Roundtcto 3 decimal places and

3)Instruction:DO NOT use the T-table, use theinvt( )program available in your calculator to calculate the t-value. Roundtcto 3 decimal places and margin of error to 2 decimal places.

A) A sample of 14 hummingbirds was randomly selected and gave a mean weight of 3.1 and standard deviation of 0.3 grams. Find the 90 % confidence interval to estimate the population mean weight of hummingbirds.

D.F.=

tc=

C.I. :3.1

B) A sample of 25 hummingbirds was randomly selected and gave a mean weight of 3.12 and standard deviation of 0.3 grams. Find the 96 % confidence interval to estimate the population mean weight of hummingbirds.

D.F.=

tc=

C.I. :3.12

C) A sample of 81 hummingbirds was randomly selected and gave a mean weight of 3.11 and standard deviation of 0.32 grams. Find the 89 % confidence interval to estimate the population mean weight of hummingbirds.

D.F.=

tc=

C.I. :3.11

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