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Two independent samples of sizes 16 and 26 were taken. In a test of equality of population means of the two samples, how many degrees of freedom are associated with critical t-value.
A class takes the exam where the average time to complete exam is normally distributed with the 40 minutes and standard deviation of 9 minutes. If class lasts 1 hour, what percent of students will h
Calculate the test statistic for the goodness of fit.
find The test statistic for testing equality of population.
Find out the test statistic value for testing the equality.
Calculate the pooled variance for the given data.
In a mobile phone shop on a Sunday morning, out of n = 77 customers x = 19 buy a mobile phone. What is the 95 percent confidence interval for the proportion of customers buying a mobile phone.
For a sample of 11 independent observations from a normal distribution of unknown μ and unknown variance σ2, the sample mean is 74.60 and sample variance is 2.2. What is the lower point of th
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ2 = 2.6, the sample mean is 52.3. What is the width of the 95 percent confidence interv
A survey of local residents has been conducted to find out the level of support for a new shopping plaza. Those surveyed were allowed to respond in one of five categories: strongly support, support,
College freshmen with high test anxiety are assigned to three groups. One group receives free individualized counselling, one group participates in a class to teach them how to decrease their anxiet
Suppose that each of the following studies cannot be analyzed using a parametric procedure. For each of the following studies, indicate the appropriate nonparametric procedure, and explain why you c
Is the average cross-sectional area of the lumen of coronary arteries for men, age's 40-59, less than 31.5 percent of the total arterial cross section.
In August 1976, Tuberculosis was diagnosed in a high school student (INDEX CASE) in Corinth Mississippi. Subsequent laboratory studies revealed that the student's disease was caught by drug resistan
A study was conducted to investigate drinking problems among college students. In 1983, a group of students were asked whether they had ever driven an automobile as drinking. In 1987 after legal dri
Self-reported injuries between left handed and right handed people were compared in a survey of 1896 college students in British Columbia, Canada. 93 of 180 left handed students reported at least on
Do data indicate a significant difference between the frequency distributions for male and females? Test at the .05 level of significance and describe the difference.
Langweita, Izakovic, and Wyler (2005) reported that self-hypnosis can significantly reduce hay fever symptoms. Patients with moderate to severe allergic reaction were trained to focus their minds on
Based upon this sample information find out what percent of variation in starting salaries is stated by GPA, and determine an equation that would predict salary from the GPA. Provide the scatter plo
The same researcher also recorded the gender of each student watching a men's basketball game in college gym and found a total of 83 females and 97 males. Is the gender distribution for basketball f
Finally, find out if there is any correlation between how well the mentor communicates with new employee with how comfortable the new employee is on the job.
Hypothesis testing is a scientific process in which a question, problem, or opportunity is answered. There is a five-step procedure that is used to reveal a response statistically. This process will
Conduct appropriate statistical test to see if there're any differences between the groups and find out if vitamin C is effective in treatment of colds.
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people must spontaneously follow a 24-hour cycle of sleeping and
Open the data file on your excel file AirlinePassengers. Point out the level of data (nominal, ordinal, ratio, or interval) measurement for each variable in data set. Notice t