A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 3 percentage points with 95% confidence if (a) he uses a previous estimate of 25%? (b) he does not use any prior estimates? Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2), tice ngs eo Lec (a) n= (Round up to the nearest integer.) and Exa (b) n= (Round up to the nearest integer.)

A vending machine is designed to dispense a mean of 7.8 oz of coffee into an 8-oz cup. If the standard deviation of the amount of coffee dispensed is 0.5 oz and the amount is normally distributed, determine the percent of times the machine will dispense more than 7.1 oz. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. *** % of the time the machine will dispense more than 7.1 oz. (Type an integer or decimal rounded to two decimal places as needed.) 4 Inco

A survey of 2279 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 427 have donated blood in the past two years. Complete parts (a) through (c) below. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). (a) Obtain a point estimate for the population proportion of adults in the country aged 18 and older who have donated blood in the past two years. p= 0,187 (Round to three decimal places as needed.) (b) Verify that the requirements for constructing a confidence interval about p are satisfied. The sample V a simple random sample, the value of is which is V 10, and the V less than or equal to 5% of the (Round to three decimal places as needed.)

A survey of 2305 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 411 have donated blood in the past two years. Complete parts (a) through (c) below. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). A Question Help (a) Obtain a point estimate for the population proportion of adults in the country aged 18 and older who have donated blood in the past two years. p= 0.178 (Round to three decimal places as needed.) (b) Verify that the requirements for constructing a confidence interval about p are satisfied. The sample a simple random sample, the value of is which is 10, and the less than or equal to 5% of the (Round to three decimal places as needed.) Enter your answer in the answer box and then click Check Answer. 1 part remaining Clear All Check Answer PAES MAY W 4 F12 F11 F9 F10 F8 F7 F6 吕口 F3 F5 F4 F2 & * $ % 7 8. 2 3 4 T Y U E R Q G H iİŞ