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Find the t value(s) for each of the following cases. Round your answers to 3 decimal places. Enter negative values as negative number. a. Upper tail area of 0.025 with 15 degrees of freedom is b. Lower tail area of 0.005 with 55 degrees of freedom is c. Upper tail area of 0.01 with 35 degrees of freedom is d. Where 98% of the area falls between these two t values with 20 degrees of freedom. ( . ) e. Where 99% of the area falls between these two 13 values with 45 degrees of freedom. ( . ) Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 65 weekly reports showed a sample mean of 17.5 customer contacts per week. The sample standard deviation was 5.6. Provide 90% and 95% confidence intervals for the population mean number of weekly customer contacts for the sales personnel. 90% confidence interval, to 2 decimals: 95% confidence interval, to 2 decimals:A simple random sample of 500 individuals provides 300 Yes responses. a. What is the point estimate of the proportion of the population that would provide Yes responses (to 4 decimals)? b. What is your estimate of the standard error of the proportion (to 4 decimals)? c. Compute the 95% confidence interval for the population proportion (to 4 decimals). ( . )