MATH408: PROBABILITY & STATISTICS
... • In this case we cannot use normal since the sample size is small and by using the sample standard deviation to estimate s, we bring in more variability into the picture and the appropriate distribution to use is the student's t-distribution. • In 1908, William S.Gosset, a chemist working for a bre ...
... • In this case we cannot use normal since the sample size is small and by using the sample standard deviation to estimate s, we bring in more variability into the picture and the appropriate distribution to use is the student's t-distribution. • In 1908, William S.Gosset, a chemist working for a bre ...
Chapter One
... Inferential statistics Inferential statistics is a body of methods used to draw conclusions or inferences about characteristics of populations based on sample data. The population in question in this case is the soft drink consumption of the university's 50,000 students. The cost of interviewing ea ...
... Inferential statistics Inferential statistics is a body of methods used to draw conclusions or inferences about characteristics of populations based on sample data. The population in question in this case is the soft drink consumption of the university's 50,000 students. The cost of interviewing ea ...
Statistics for Business and Economics, 6/e
... Statistics for Business and Economics, 6e © 2007 Pearson Education, Inc. ...
... Statistics for Business and Economics, 6e © 2007 Pearson Education, Inc. ...
Statistics for Business and Economics, 6/e
... Statistics for Business and Economics, 6e © 2007 Pearson Education, Inc. ...
... Statistics for Business and Economics, 6e © 2007 Pearson Education, Inc. ...
Hypothesis testing
... Hypothesis testing with sample data Do two variables have a nonrandom relationship? • Four basic steps – State the null and research hypothesis – Select a significance level (alpha ()) – Select and compute a test statistic – Make a decision by comparing to critical value of the test statistic. ...
... Hypothesis testing with sample data Do two variables have a nonrandom relationship? • Four basic steps – State the null and research hypothesis – Select a significance level (alpha ()) – Select and compute a test statistic – Make a decision by comparing to critical value of the test statistic. ...
Review for the Final
... eligibility. The state of California uses sampling to monitor its counties to see whether they exceed the 4% error rate, which can result in economic sanctions. In one county, 9 cases out of 150 were found to be in error. (a) Find a 98% confidence interval for the error rate for the county (proporti ...
... eligibility. The state of California uses sampling to monitor its counties to see whether they exceed the 4% error rate, which can result in economic sanctions. In one county, 9 cases out of 150 were found to be in error. (a) Find a 98% confidence interval for the error rate for the county (proporti ...
HOMEWORK #5, due Lecture \#7
... that the population standard deviation is = 2. a) Using the actual data, what is the sample mean? - The sample mean is defined as (the sum of all data) divided by (sample size). You can see the result from SPSS. The sample mean is 3.08. b) Construct by hand the 95% confidence interval for the popu ...
... that the population standard deviation is = 2. a) Using the actual data, what is the sample mean? - The sample mean is defined as (the sum of all data) divided by (sample size). You can see the result from SPSS. The sample mean is 3.08. b) Construct by hand the 95% confidence interval for the popu ...
Statistics - Groch Biology
... •The method assumes that the results follow the normal distribution (also called student's t-distribution) if the null hypothesis is true. •This null hypothesis will usually stipulate that there is no significant difference between the means of the two data sets. •It is best used to try and determin ...
... •The method assumes that the results follow the normal distribution (also called student's t-distribution) if the null hypothesis is true. •This null hypothesis will usually stipulate that there is no significant difference between the means of the two data sets. •It is best used to try and determin ...
Lecture 8
... hypothesis, the other incorporating a less specific set of assumptions. • All modelling inevitably involves some assumptions about the phenomenon under study; hence hypothesis testing will always involve comparison of the fit of a hypothesised model with that of an alternative which also incorporate ...
... hypothesis, the other incorporating a less specific set of assumptions. • All modelling inevitably involves some assumptions about the phenomenon under study; hence hypothesis testing will always involve comparison of the fit of a hypothesised model with that of an alternative which also incorporate ...
... larger (or smaller) than 26, then we would be inclined to think that the handling treatment was effective. The crucial question is, “How much must the mean weight differ from 26 pounds to convince us that the treatment was effective?” The conventional way of determining the extent to which the treat ...
