answer each of the three questions. Choose only one confidence interval calculator for each problem. Confidence Interval for means with the Population Standard deviation σ Known Confidence Interval...

answer each of the
three
questions. Choose only one confidence interval calculator for each problem.

1. Confidence Interval for means with the Population Standard deviation σ Known


2. Confidence Interval for means with the Population Standard Deviation σ UnKnown


3. Confidence Intervals for Population Proportions

NOTE: The Calculators are
NOT
in the same order as the questions below. Once you’ve chosen a correct calculator for each exercise, fill in the yellow cells with the information from the exercise and the green cells are the solutions. For the Confidence interval, use decimal rather than percentages. For example 90% is 0.90

Give your final answer to 2 decimal places.

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1. Out of 100 adults surveyed in a small town, 44 had at least one child. Based on this, construct a
   80%
   confidence interval for the true population proportion of people with at least one child. Give the answer in the form of a
   confidence statement.

(

Example

: With 99% confidence, we can say the true population proportion of people with at least one child is in between_____ and _____.)

1. You measure 42 dogs' weights from a special breed, and find they have a mean weight of 108 ounces. Assume the population standard deviation is 5.6 ounces. Based on this, construct a
   99%
   confidence interval for the true population mean dog weight. Give the answer in the form of a
   confidence statement.
   

1. In a survey, 73 parents were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $40.75 and standard deviation of $3.23. Find the confidence interval at a
   95%
   confidence level. Give the answer in the form of a
   confidence statement.