Which of the following is NOT true about the t distribution? Select one: is symmetrical around a mean of zero is less spread out compared to the normal distribution approaches the normal distribution as the sample size increases 0000 has more area in the tails than does the normal distribution Assume that in a simple linear regression output, the multiple R value is 0.75. Which of the following Mar statements is NOT correct? Select one: The estimated regression equation must have a positive slope The direction of the relationship between the independent and dependent variables depends on whether the slope is negative or positive The relationship between the independent and dependent variables is strong 00 CO The estimated regression equation may have a negative slope In an experiment conducted to test the lifespan of car batteries, two companies submitted 20 batteries Mark each. For commy_A: 10 lost power after exactly 50 months, and the rest lost power after exactly 70 months. For commyjz 10 lost power after exactly 60 months, and the rest lost power after exactly 65 months. Which of the following statements is true? Select one: 0 The 90% confidence interval for the mean battery lifespan is more precise for Company B O The width of the 90% condence interval for the mean battery lifespan is wider for Company B O The standard deviation of battery lifespans from Company A and B is the same 0 All of the statements are true