Explain why computing a variance of several numbers is like analyzing their differences

Explain why computing a variance of several numbers is like analyzing their differences

You have been saving the same amount of money every week. If you have been saving five dollars more than a number for five weeks less than that number, how much money have you saved so far? Explain...

A psychologist is interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of 16. The psychologist randomly selects...

If n=13, ¯ x x¯(x-bar)=36, and s=5, find the margin of error at a 90% confidence level Give your answer to two decimal places.

Find the 14th percentile.

he effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 15.4 for a sample of size 341 and standard deviation...

Under certain conditions, there is a 0.2 probability that a randomly selected driver will fail a driving test. If 2 randomly selected drivers are tested under these conditions, what is the probability...

According to the U.S Census Bureau Data, 60% of those eligible to vote actually do vote. If 2 eligible voters are chosen at random, what's the probability they both vote? A)0.036 B)...

The claim is that the IQ scores of statistics professors are normally distributed, with a mean less thanless than 122122. A sample of 2727 professors had a mean IQ score of 119119 with a standard...

a construction zone on a highway has a posted speed limit of 40 per hour. The speedspeed of vehicles passing through this construction zone are normally distributed with a mean of 46 miles per hour...

The National Association for Caffeine is needed had stated 79% of all caffeine drinkers prefer coffee. A random sample 40 caffeine drinkers is selected. Find the probability the sample proportion...

Use a 0.05 significance level to test that the majority of people ARE smoking a year after the treatment. a) what is the null hypothesis? b) what is the alternative hypothesis? c) what...

a normal distribution has a mean of 100 with standard deviation of 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between x=90...

If in a video game there is a 1/50 chance a monster will drop an item once killed, aren't the odds of it taking 171 kills greater than a smaller amount around like 50 kills? I understand there is...

TV ratings- A broadcast gets a 4.6 rating from markets comprising 65% of the population. The broadcast's final rating when 100% of the markets report in is 3.2. What rating did the broadcast get in...

Its a golf question, par is 74 and standard deviation is 6. I already made the normal curve and showed the 68 - 95 - 99.7 rule. Need to know how many shots about 95% of golfers took.

billy has 15 min to get to his after-school job. Despite his best efforts, he is frequently late. His employer says that unless he arrives to work on time consistently, he will lose his job. He has...

The rowan (Sorbus aucuparia) is a tree that grows in a wide range of altitudes. To study how the tree adapts to its varying habitats, researchers collected twigs with attached buds from 12 trees...

Which county had the highest median income between 2006 to 2010? The answer is Los Angeles. I have a real data, how do I turn this question to a hypothesis and which test do I use?

A pizzeria has six meat toppings and nine vegetable toppings