When doing CPR, the recommended rates of chest compressions per minute for all patients is:

Find the critical z value for a left-tailed test with α = 0.025.

A client calls. “My dog was fine an hour ago when I let him outside. I just let him in and his eyes are swollen shut and his nose is really big. He acts like his face is really itchy, he keeps rubbing it on the carpet.” What could be wrong with this client’s dog? What will you advise?

A simple random sample of size n = 450 is obtained from a population whose size is N = 13,000 and whose population proportion with a specified characteristic is p = 0.2.  Describe the sampling distribution of p hat.  

Signs of rat poisoning, including anticoagulant and bromethalin, are usually evident within hours after ingestion.

A manufacturer claims that the mean lifetime of its lithium battery is 1500 hours. A homeowner selects 40 batteries and finds the mean lifetime to be 1490 hours with a standard deviation of 80 hours. Test the manufacturer’s claim. Use α= 0.01.

A survey of 1010 college seniors working towards an undergraduate degree was conducted. Each student was asked, “Are you planning or not planning to pursue a graduate degree?” Of the 1010 surveyed, 658 stated that they were planning to pursue a graduate degree. Construct and interpret a 98% confidence interval for the proportion of college seniors who are planning to pursue a graduate degree.

The number of violent crimes committed in a day possesses a distribution with a mean of 3.8 crimes per day and a standard deviation of 2 crimes per day.  A random sample of 100 days was observe, and the mean number of crimes for the sample was calculated.  Describe the sampling distribution of the sample mean.  

When doing a C section, it is important to have the bitch or queen in a deep plane of anesthesia.

In order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is less than two hours in estimating the average time it takes to install tile flooring. Previous contracts indicate that the standard deviation is 4.5 hours. How large a sample must be selected?