Hoping to lure more shoppers downtown, a city builds a new public parking garage in the central business district. the city plans to pay for the structure through parking fees. for a random sample of 44 weekdays, daily fees collected averaged $126, with a standard deviation of $15. suppose that for budget planning purposes, the city needs a better estimate of the mean daily income from parking fees than was provided by the 90% confidence interval it originally created. complete parts a through d below.
what assumptions must you make in order to use these statistics for inference? select all that apply.
a. the data values should be dependent.
b. the sample size is at least 10% of the population.
c. the distribution is unimodal and symmetric with no outliers.
d. the data are a random sample of all days. find a 90% confidence interval for the mean daily income this parking garage will generate.