A sample of 100 items is taken at random from a batch known to contain 40% defectives. What is the probability that the sample contains (i) at least 44 defectives (ii) exactly 44 defectives?
A Statistician / psychologist can help you with your statistics in spss, amos, statistica, Econometrics, minitab, stata, r, gpower. I can do factorial analysis, correlation, time series, path analysis, anova, ancova, glm, non parametric (e.g. bootstrap), reliability, standardization, validity, mediation and moderation analyses can be done. Normality check as well plagiarism check is offered. We can also evaluate questionnaires. Private lessons are offered also using skype. estatistics. email: firstname.lastname@example.org.
Presumably you have a random sample X_1, X_2, ... X_100 from a Bernoulli trials population (0 for failure; i.e. good item and 1 for success - bad item). The parameter is p = .4. Don't you then know the distribution of X_1+X_2+ ... X_100? Assuming you do, you can then answer your questions using this distribution.