In a survey amongst freshmen at StudyMore College, the average number of hours spent studying for their math class was 15.4 hours per week with a standard deviation of 2.65. Assuming the population...

In a survey amongst freshmen at StudyMore College, the average number of hours spent studying for their math class was 15.4 hours per week with a standard deviation of 2.65. Assuming the population...

A battery pack manufacturer claims their product will run two cell phones playing Pokemon go an average of 12 hours with a standard deviation of 2.4 hours. A random sample of 40 battery packs is tested...

What is the probability that a randomly selected pregnancy lasts less than 224 days? 0.358 *What is the probability that a random sample of 21 pregnancies has a mean gestation period...

The mean incubation time for a type of fertilized egg kept at 100.7°F is 19 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 2 days. (a)...

Could someone tell me please what is the correct answer to this question? The alternative hypothesis is best explained as: • A prediction that the sample statistic is false • The test...

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...

the numbers I was given was 40 44 35 49 35 43 35 36 39 37 41 41 48 52 37 45 40 36 35 50 42 51 33 34 51 39 I'm a senior this year and I'm trying to graduate with my class because I was...

Are you more likely to make a Type I error when using a large sample or a small sample?

I solve the range which is 23

For the dinner special at a restaurant, the customer must choose an appetizer, an entree, a side dish, and a dessert. Here are the items to choose from. How many dinner specials are possible...

I need help with this question

Which statistical test should I use to see if there is a difference in employment vs unemployment between two surveys one from May and one from June (with different respondents and different numbers...

I'm currently writing a statistics paper based on this study: http://www.environmentnewjersey.org/programs/nje/no-bees-no-food I need to find the explanatory variable, the response...

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 student takes a sample of n=30 books and records the publication date for each. The sample produces an average of M=23.8 years with a variance of s square=67.5. Use this sample to conduct a...

I have no idea what I'm doing

An urn contains pink and green balls. Five balls are randomly drawn from the urn in succession, with replacement. That is, after each draw, the selected ball is returned to the urn. What is the probability...

There are nine raincoats in size 6-8 on sale in the girl's department at Bloomingdale's. Three have tulips, four have bunnies, and two have hearts. Mack is in a rush and randomly chooses two raincoats...

According to the Center on Philanthropy at Indiana University, the mean charitable contribution per household among households with income of $1 million or more in the United States in 2005 was $17,072...

Write the null and alternative hypotheses for the following example. Determine if it is a case of a two-tailed, a left-tailed, or a right-tailed test. To test whether the mean starting salary...