Stats Help for College-level Students

Neyman-Pearson Significance Testing: Critical Regions

What I'm looking at immediately is "Using the .05 cutoff figure, find an appropriate critical region for testing the null hypothesis 'theta is greater than or equal to .154 against the alternate hypothesis 'theta is less than .154' and provide a Neyman-Pearson analysis.". Background facts for the problem: In the county, 1 ...continues

Preparing forlicensing exam and need study guide, tutoring, with probability & statistics

Need simplyfied lessons in statistics and probability.

Hypothesis Testing - Compute the statistical test using the z test and decide what to do with the null.

A study was conducted on the annual incomes of public school teachers in the state of x, in metropolitan area of less than 100,000, and in metropolitan areas having a population of over 500,000. Some sample statistics are: The group has the following characteristics: Less than 100K Population 45 Mean $31,290 Standard Devi ...continues

Hypothesis Testing-Compute the statistical test using the z test and decide what to do with the null.

A sample of 40 households with school-age children in Middletown was randomly selected. The mean length of time was 7.6 years, with a standard deviation of 2.3 years. A sample of 55 households in Brockton revealed the mean length of time was 8.1 years, with a standard deviation of 2.9 years. At the .05 level of significance, can ...continues

Hypothesis Testing-Compute the statistical test using the z test and decide what to do with the null. Also state the Research Hypothesis and the Null Hypothesis.

A sample of 40 observations is selected from one somewhat normal population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second source. The sample mean was 99 and the standard deviation was 6. Conduct a test of the hypothesis using the .04 level of significance.

9 short answer type questions on mean, standard deviation, range, probability, permutation

1. Compute the arithmetic mean for the following data: 8, 2.2, 25, 7, -9, 10, 2, and 5.9. 2. An Embry-Riddle senior performed the same experiment on three groups of subjects (with permission!) and obtained mean scores of 84, 69 and 76. The groups consisted of 13, 31, and 27 subjects respectively. What is the overall mea ...continues

Questions on probability distributions - Binomial, Poisson

1 The Kwik Klean Car Wash loses $30 on rainy days and gains $120 on days when it does not rain. If the probability of rain is 0.15, what is the expected value of net profit? 2. The Newman Construction Company bids on a job to construct a building. If the bid is won, there is a 0.7 probability of making a $175,000 profit and t ...continues

Hypothesis Testing - Compute the statistical test using the t test and decide what to do with the null.

School A states the average number of days missed by each student is 4.0. Office personnel randomly sampled a portion of their attendance records to determine if this claim was accurate. For the previous year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1 ...continues

Hypothesis Testing -Compute the statistical test using the t test and decide what to do with the null.

A sample of scores on an examination given to both males and females in QNT 575 are: Males - 72,69,98,66,85,76,79,80,and 77 Females - 81,67,90,78,81,80, and 76 At the .01 level of significance, is the mean grade of the female students higher than that of the males? I need a step by step calculation of the problem. ...continues

Penrose Consulting

Draw a scatter plot of these two variables. Based on this plot only, does it appear that a linear relationship exists between the two variables? b) Compute the correlation coefficient and discuss what it measures. c) Test to determine whether the population correlation coefficient is actually 0, using an alpha level of 0 ...continues