Question

t i A sportswriter wished to see if a footbalil filed with helium trevels farther, on were randamly divided i nte two groups of nine participants each. Group kicked a football iiled with helum to the recommended pressure Group 2 kickeda football filled with air to recommended pressure. The mean yardage for group 1 was-30 yards with a standard deviation s- olunteers if al members of ehis population kicked, respectively, a helium-filled and an alir-filed football Assume that two sample t precedures are safe to use. Suppose in a similar experiment using 18 different adult male the Let p and p2 represent the mean yardage we would observe for the entire popuiation represented by the volunteers the sportswriter's dats had resulted in a Pivalue of 0.038 for the teat of the mo: μί-an, ,% : u? μ2-1n that case, the sportswriter should: not reject the null hypothesis at the 5% signi cance level because tho dumerence in reject ne null hypothess at thn S% signnace level because the n not reject the man hypoenesis reject the null hypothesis at tne s% sgnnace level because the average ostances is statistealy winne e the difference in average distances is not statisticaly signitficant at the 5% signMcance level because the areefence in average distances not statistica, siena e the difference in average distances is statisticaly significant Suppose tht 95% corndence interval ostimete tor M-ภา. (-5, 23. From this, we know that the Avalue for the test of h"A-M, -.-a, is: O equal to 0.05 0 larger than 0.05. smaler than 0.0s. We cannot know which of the above is true without more Information. which a . A pogutation is NG. 25) Aresearcher is parning a srvey-theerpose of estimating-, weh , 9s%-aence intervai The researcher's goal is to hrve.mwyn of eers saad nthe past, the researcher kiows that heshold only epet 25% response rate. The resear her should plan for sampie of sie: 388

Answer 1

2 ーfejed the now hYPc. athy. (res. because the differone in curc og dintontes is 5 느 491炳- 4Jo 7 i 25 7, and re , С.-S 산ーくγ е つ4 ppern rete