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Whenever your decision is to reject the null hypothesis, there is a risk of a Type I error.
A manufacturer of VCRs purchases a particular microchip, called the LS-24 from three suppliers; Hall Electronics, Schuller Sales, and Crawford Components
If you were to conduct right-tailed hypothesis test at 5% significance level, you choose the critical value this way.
The average life span of a dog is proportational to the amount of calcium consumed.
Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis if
The mean length of a work week for the population of workers was reported to be 39.2 hours (Investor's Business Daily, September 11, 2000)
A researcher knows that the population mean among college students taking the Social Conformity Test is a "neutral" 100.
You want to check the claim that the Laurelhurst area has higher day care charges then the non Laurelhurst areas.
You own a small tea company, Sweet Leaf, NASDQ ticker symbol LEAF. You are looking at marketing costs versus benefits
In the past, 38% of all students pass the state high school exam on their first try. A school posts a first time passing rate of 56%
Two high school principals are arguing about who has the better school. This principal for Hard Rock High, Desi Mall, draws a random sample of 100
North Carolina State University looked at the factors that affect the success of students in a required chemical engineering course
A supplier of 3.5" disks clams that only 1% of the disks are defective. In a random sample of 600 disks, it is found that 3% are defective
In 2002, approximately 177,000 tax returns were sampled to obtain estimates of various parameters.
Hugger Polls contends that an agent conducts 53 in-depth home surveys every week. A streamlined survey form has been introduced
A study was conducted of the annual incomes of beginning probation officers in metropolitan areas of less than 100,000 population
The first sample consists of 5 bags of M&M's with the following number of blue pieces in each bag 10, 11, 9,10,10.
Gun Violence. The Harris Poll asked a sample of 1009 adults which causes of death they thought would become more common in the future.
Using a significance level of α=0.05, determine if there is a significant linear correlation between the heights and shoe sizes of the baseball team.
Use the hypothesis testing method to determine if a linear correlation exists for each set of data. (use alpha = 0.5).
The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes.
A statistically significant result occurs when the value of the test statistic falls in the rejection region.
A biologist suspected that in the 20-24 age group, males have a higher mean diastolic blood pressure than females.
What is more important for the researcher to be concerned about in a study, Type I or Type II errors? Why? How does the type of data collected
In research, one often hopes to be able to state results using a confidence level that the results are valid of 90% or more