If a researcher is using a t statistic to test a null hypothesis about a population, what information is needed from the population to calculate the t statistic? Group of answer choices

a. You must know the population mean.

b. You must know the population variance or standard deviation.

c. You must know the population mean and the variance or standard deviation

d. The t statistic does not require any information about the population.

Need now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

Which of the functions graphed below has a removable discontinuity?

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.