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State your null and alternative hypothesis for the following cases. Please explain how do you make that decision on which is alternative and which is null.
Explain the difference between testing a single mean, testing the difference between two means from an "independent sample" and testing mean differences
A certain type of cable was advertised as having a breaking strength of 1000 pounds. A test of XX pieces of this cable was conducted and the mean breaking
A legal researcher is studying the age distribution of juries by comparing them with the overall age distribution of available jurors
Given the following data from two independent samples from which the population standard deviation is known, conduct a two-tailed hypothesis test
The following sample data shows the quarterly earnings in millions for two US companies.
CJ's Discount Appliance Store issues its own credit cards. The credit manager wants to know if the mean monthly, unpaid balance is more than $400
Develop one research question from which you will formulate a research hypothesis. NOTE: Our research question would be
Koi's Yummy Burgers claims that 90% of its orders are delivered within 10 minutes of the time the order is placed.
Hiren is the accounts receivable manager of an local hopital. The hospital is concerned that people are using ER services have sufficient resources
The production manager at Bellevue Steel, a manufacturer of wheelchairs, wants to compare the number of defective wheelchairs produced on the day shift
A researcher is testing the effectiveness of a new herbal supplement that claims to improve memory performance.
Is the null hypothesis more likely to be rejected at alpha = 0.01 than alpha = 0.10? As the significance level increases to alpha = 0.10 from alpha = 0.01
In an evaluation of the medical lab, the manager is interested in the efficiency of three technicians when they process four routine blood tests
A clinical investigator is interested in understanding the relationship between demographic factors and congestive heart failure, measured by a cardiac index
The average monthly gasoline (gallon) purchase for a family with 2 cars is 62 gallons.This statistic has a normal distribution with a standard deviation = 6
JoLynn Miller is a physical therapist at the local senior center. She has been testing a new procedure to improve leg strength that requires the patient
A recent study focused on the number of times men and women who live alone buy take-out in a month.The information is summarized below
A recent study at a local college claimed that the proportion, P of students who commute more than fifteen miles to school is no more than 15%
A postal researcher wanted to test the theory that a higher response rate is achieved when a postal questionnaire is sent out
A researcher knows that the population mean among college students taking the social test is a "neutral" 100.
What does it mean practically when we say that we found a significant difference between two groups using a t-test?
According to the Coffee Research Organization, the typical American coffee drinker consumes an average of 3.1 cups per day
Raising chickens in commercial chicken farms is a growing industry, as there is a shift from red meat to more white meat.
The recommended daily allowance (RDA) of cobalamine (Vitamin B12) for growing teens is 2.4 µg (micrograms).