(a) = .8 and n= 110 (Round your answers to 3 decimal places.) 95 percent confidence intervals is 1. 98 percent confidence intervals is 1. 99 percent confidence intervals is 1.

Out of 200 people sampled, 78 had dogs. Based on this, construct a 95% confidence interval for the true population proportion of people with dogs. give your answers as decimals to three places  ________ < p < _______

(#20) please help

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q21- The z value for a 95% confidence interval estimate is: Select one: a. 2.12. b. 1.82. c. 2.00. d. 1.96.

In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $44 and standard deviation of $6. Construct a confidence interval at a 98% confidence level.Give your answers to one decimal place._______________  ±  _______________Interpret your confidence interval in the context of this problem.