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amistre64
 one year ago
Best ResponseYou've already chosen the best response.1its the area of the tails ....

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1determine the z or t score using the Ha as the cutoff stat for Ho the Pvalue is just the area left in the tails

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0This is my particular problem: A survey of 1910 people who took trips revealed that 136 of them included a visit to a theme park. Based on those survery results, a management consultant claims that less than 8% of trips include a theme park visit. Test this claim using the alpha= .01 significance level. Assuming Ho, The z score is? The critical z score for declaring significance is? The P Value of the Hypothesis test is_____?

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1are you using a ti83, stat program, or just tables in the book?

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1dw:1370969246279:dw

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0I found the z score to be 1.4168...then the critical z score using norm.s.inv(.99) on excel to be 2.32...but I do nt know how to find the p value...would I need to find the z score for .08 and use that value into norm.s.dist(z value, cumulative)? that is what I think to do...but I don't know how to find the z value with P (x<.08)

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0we have been using excel..wow I am so glad I found this site, I have been searching for a free help site and had no luck

amistre64
 one year ago
Best ResponseYou've already chosen the best response.11910*.08 = 153 use 153 is your test value

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1since there is no standard deviation given, should we do a t stat, or a z stat? sample size seems well over 30 to me

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0I believe so...you mean z score?

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1its similar to a zscore stat, but uses a t distribution as opposed to a normal distribution .... its used for unknown standard deviations

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.2@ViennaJade , Excel gives pvalue of .078 for zscore of 1.4168 "NORMSDIST(1.4168)"

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0hmmm dumbcow let me try that

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0admiter I found the standard deviation by hand

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1136/1910 = .0712 as a "mean" this is less then 8% of the sample size already so i don think the score of 8% will be negative

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0I just checked dumbcow's answer and it was right

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0now I'm not sure I remember why his answer is right though...

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1\[\Large\frac{136}{1910}\pm Z_{.01}\left( \frac{\frac{136}{1910}\frac{1774}{1910}}{\sqrt{1910}} \right)\].01 in one tail is .02 in both tails,relates to a confidence interval of 98%, z=2.33 a confidence interval of 98% is \[\Large .0712\pm 2.33\frac{(.0712)(.9288)}{\sqrt{1910}}\] cows answer was correct, thats nice :)

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1opps, forgot to sqrt the whole thing

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0why are you finding the confidence interval? I'm confused

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1so an interval of .057 to infinity .... just trying to recall some stuff. how would you determine the test statistic for less then 8%?

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0I would want to use the z score formula , plug in 153/1910.08 all over the standrd dev of .006208

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0and then use excel =norm.s.dist(the z score)

amistre64
 one year ago
Best ResponseYou've already chosen the best response.1.08  153/1910 of course the only differnce is a sign

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0amistre thank you so much for helping me...and dumbow...do you get paid for this?

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.2http://en.wikipedia.org/wiki/Statistical_hypothesis_testing#Common_test_statistics this problem is a 1proportion z test right? \[z = \frac{.08  \frac{136}{1910}}{\sqrt{\frac{136}{1910}(1\frac{136}{1910})}}\sqrt{1910}\]

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0dumbcow I have no idea what that equation is...we were taught that z score of p hat= p hatHo/stdev

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.2how are you finding std dev?

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0I don't think it's 1proportion because they want less than .08

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0stdev of p hat= sqrt(p*q/n)

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.2oh ok, well in that case you already did everything and didn't need any help :)

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0I still didn't get how you used the z score I found and used that to find the p(x<.08)? sorry..

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.2dw:1370971511146:dw the pvalue is the probability of being "left" of zscore on the bell curve the excel function "normSDist" will tell you the area "left" of a given zscore

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.2if pvalue < .01 , reject H0 otherwise Fail to reject H0

ViennaJade
 one year ago
Best ResponseYou've already chosen the best response.0I think I get it. Thank you so much Amistre and dumbcow! :))
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