All the three cases a,b,c are simple random samples
in the first case all the picks have independent probabilities and the probability of one pick is not dependent on another pick
in the second and third case also the probabilities are independent hece its a simple random sample
A statistics instructor wants to obtain a Simple random sample (SRS) of five students from her...
7. A statistics instructor wants to figure out how long it will take her students, on average, to complete an exam She believes that completion time should follow an exponential distribution with mean λ. She collects data from 10 randomly selected students, and the class meets for 50 minutes. (a) What are the appropriate hypotheses in this case? Explain your reasoning. (b) The instructor opts to use a signficance level of 0.10. In the context of the scenario, what does...
A student conducts a simple random sample of students from her high school and finds that 32 out of 100 students in her sample regularly walk to school. Give a point estimate for the proportion of all students at her high school who regularly walk to school.
A student conducts a simple random sample of students from her high school and finds that 22 out of 110 students in her sample regularly walk to school. Give a point estimate for the proportion of all students at her high school who regularly walk to school. using the t-table
2. Suppose that a random sample of 41 state college students is asked to measure the length of their right foot in centimeters. A 90% confidence interval for the mean foot length for students at this university turns out to be (21.709, 25.091). If we now calculated a 95% confidence interval, would the new confidence interval be wider than or narrower than or the same as the original? b. Suppose two researchers want to estimate the proportion of American college...