What standard normal (z) has 61% of the distribution to the left of it? copy and paste from excel.

The number of calories consumed by a student at lunch is Normally distributed with a mean of 1040 and a standard deviation of 378.

Consider the top 15% of students. What number of calories is the point that has 15% of students above it?

Every year scientists from the Maryland Department of Natural Resources do the Blue Crab Winter Dredge Survey to find out how healthy the population of crabs is in the Chesapeake Bay. It would take a huge amount of time and money to scrape the floor of the entire Bay, so they choose a few places randomly and drop the gear.

Say that the population average number of crabs per square meter is known to be 10 with a population standard deviation of 1.9. If a sample of 50 crabs is taken, What is the standard deviation of the sampling distribution?

30 children participating in a preschool program were tracked over time. Much later, salaries of the 30 people (now grown!) averaged $76,400 with a sample standard deviation of $13,225. Researchers use the alternative hypothesis that the salaries of program participants will belower thanthe local average. They use a significance level of 1%.

To test whether the salaries are higher than the local average, whatcritical valuewill they use? Copy and paste from Excel or enter the entire value listed on the appropriate (Z or T) distribution chart.

A brewer is testing the alcohol content of her latest beer, a coffee porter. Her target percentage is 7% and she wants to know to do a two-tailed test to see if there is either too much or too little. She takes a few samples and based on the resulting data calculates an observed z-value of 2.37. What is the p-value she can compare to the significance level to decide whether she is ok or not?