A t-test is only possible when we have a                                              independent variable and a                                       dependent variable.       categorical; categorical       interval/ratio; categorical       categorical; interval/ratio       interval; interval

Please break down

Need help on a and b

A special bumper was installed on selected vehicles in a large fleet. The dollar cost of body repairs was recorded for all vehicles that were involved in accidents over a 1-year period. Those with the special bumper are the test group and the other vehicles are the control group, shown below. Each "repair incident" is defined as an invoice (which might include more than one separate type of damage).  Statistic Test Group Control Group Mean Damage x¯1x¯1 = $ 1,101 x¯2x¯2 = $ 1,766 Sample Standard Deviation s1 = $   696 s2 =   $ 838 Repair Incidents n1 =      12 n2 =       9  (a) Construct a 90 percent confidence interval for the true difference of the means assuming equal variances. (Round answers to 3 decimal places. Negative values should be indicated by a minus sign.) (b) Repeat part (a), using the assumption of unequal variances with Welch's formula for d.f. (Round answers to 2 decimal places. Negative values should be indicated by a minus sign.) (d) Construct separate…

What type of data are required for Independent Variable (IV) and Dependent variable (DV) in ANOVA? Group of answer choices DV is continuous and IV is categorical DV is categorical and IV is categorical DV is categorical and IV is continuous DV is continuous and IV is continuous Type of data does not matter for ANOVA

Help please!