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anonymous
 one year ago
Hey guys, I really need help! Will fan and medal :)
Scores on a statewide standardized test are normally distributed with a mean of 12.89 and a standard deviation of 1.95. Certificates are given to students whose scores are in the top 2% of those who took the test. This means that they scored better than 98% of the other test takers. Marcus received his score of 13.7 on the exam and is wondering why he didn’t receive a certificate. Show all work to determine whether Marcus’ score was high enough to earn a certificate. Write Marcus a letter about why he didn't recieve a certificate.
anonymous
 one year ago
Hey guys, I really need help! Will fan and medal :) Scores on a statewide standardized test are normally distributed with a mean of 12.89 and a standard deviation of 1.95. Certificates are given to students whose scores are in the top 2% of those who took the test. This means that they scored better than 98% of the other test takers. Marcus received his score of 13.7 on the exam and is wondering why he didn’t receive a certificate. Show all work to determine whether Marcus’ score was high enough to earn a certificate. Write Marcus a letter about why he didn't recieve a certificate.

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh, and include a brief summary of your statistical analysis in your letter. :) Almost forgot.

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1his score is 13.7, the mean is 12.89, and the standard deviation is 1.95 convert his score to a zscore using the formula zscore = (given value  mean)/standard deviation then, use your calculator to determine the percentage of data values that fall below mark's score (normalcdf(99, marks score)). if this value is greater than 0.98, then that means that Mark is in the top 2%. Otherwise, Mark is not in the top 2%.

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1small correction: normalcdf(99, marks zscore)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So the zscore would be 13.7  12.89/1.95?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So (13.7  12.89)/1.95?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Now, I'm kind of confused about finding the marks below Marcus' score...

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1normalcdf(99, marcus' zscore) I meant to say "Marcus", not "Mark")

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sorry, the data points below Marcus' score

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1what is normalcdf(99, marcus' zscore)?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What does normalcdf mean?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1do you know how to use a graphing calculator?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Umm, no... But I have a regular scientific one

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I don't need one for what I'm doing... Maybe... I'm not sure lol :P

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1hm, did your teacher show you how to use a ztable?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes :) I have a ztable for positive and negative values.

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1great! Marcus' zscore is 0.415, do you know how to use the ztable to find the area to the left of the zscore?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I think so. Is it .65910?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1yup, that's about what I got, too! do you know what .65910 means?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1I mean, do you understand what that number represents?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It means that he falls in with the scores of %65.9 of his class?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1not quite, it means that he scored better than 65.9% of the other students in order for Marcus to be in the top 2% and get the certificate, he needs to score better than 98% of all the other students so, do you think he got the certificate?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ooh, ok! :) Nope, he didn't.

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1great, we've answered the question! good job

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yay! Thank you so much @Vocaloid

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I fanned and medaled :)

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.1thanks, I really appreciate it ^ ^
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