A sample of 20 students who had recently taken introductory statistics yielded the following information on brand of calculator owned (T = Texas Instruments, H = Hewlett- Packard, C = Casio, S = Sharp):

a. Estimate the true proportion of all such students who own a Texas Instruments calculator.
b. Of the ten students who owned a TI calculator, 4 had graphing calculators. Estimate the proportion of students who do not own a TI graphing calculator.

Transcribed Image Text:

Т H т т н SST т с T HC TTS т т т Т T C H н H T