Cost of Braces The average cost for teeth straightening With metal braces is apprUXimately $5336. A nationwide franchise thinks that its cost is below that figure A random sample of 27 patients across the country had an average cost of $5259 with a standard deviation of 8630. At (t = 0.05. can it be concluded that the mean is less than $5336? Assume that the population is approximately normally distributed. Part 1 of5 (a) State the hypotheses and identifyr the claim. This hypothesis test is a lone-tailed not claim claim Y test. Espar'ml annlll- (b) nd the critical value(s). Round the answer(s) to at least three decimal places. If there is more than one critical value, separate them with commas. Critical value(s): (1:) Compute the test value. Always round t score values to at least three decimal places. r=m Espanol Automobiles Purchased An automobile owner found that 20 years ago, 74% of Americans said that they would prefer to purchase an American automobile. He believes that the number is much greater than 74% today. He selected a random sample of 48 Americans and found that 42 said that they would prefer an American automobile. Can it be concluded that the percentage today is greater than 74%? At a = 0.05, is he correct? Use the critical value method with tables. Do not round intermediate steps. Part 1 of 5 (a) State the hypotheses and identify the claim. Ho: p = 0.74 not claim 0=0 00 H : p > 0.74 claim 0*0 030 020 This hypothesis test is a one-tailed test. p X 5(b) nd the critical value(s). Round the answer to two decimal places. If there is more than one critical value, separate them with commas. critical value(5): - (c) Compute the test value. Always round 7. score values to at least two decimal places. Fm Television Set Ownership According to Nielsen Media Research, of all the U.S. households that owned at least one television set, 83% had two or more sets. A local cable company canvassing the town to promote a new cable service found that of the 299 households visited, 231 had two or more television sets. At a = 0.01, is there sufficient evidence to conclude that the proportion is less than the one in the report? Do not round intermediate steps. Part 1 of 5 (a) State the hypotheses and identify the claim. Ho : P = 0.83 not claim 0=0 00 H1 : p