For a confidence level of 80% with a sample size of 32, find the critical t value. Submit Question

need margin of error and 90% interval

The following table represents the number of free throws a typical NBA player makes in three attempts. Free Throws Made 0 1 2 3 Probability 0 0.3 0.4   What is the probability needed in order to make this a valid probability distribution? 0.4 0.2 1 0 None of the above What is the mean of this distribution? 0.25 0.233 1.5 2 None of the above What unit of measurement does the standard deviation have? No unit of measurement Free throws Square root of free throws Free throws squared None of the above, as it depends on the situation

A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 4 points with 99% confidence assuming s=16.4 based on earlier​ studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size​ required? LOADING... Click the icon to view a partial table of critical values. A​ 99% confidence level requires nothing subjects. ​(Round up to the nearest​ subject.) A 90% confidence level requires nothing subjects. ​(Round up to the nearest​ subject.) How does the decrease in confidence affect the sample size​ required?     A. Decreasing the confidence level decreases the sample size needed.   B. Decreasing the confidence level increases the sample size needed.   C. The sample size is the same for all levels of confidence.