78% of all Fall 2014 CSUN freshmen returned to CSUN in Fall 2015. You think that the percentage may be different now, so you take a random sample of 250 of last year's freshmen and tind that 84% returned, www.csun.edu/counts/one_year_continuation_rate.prp a. What is p? What is the number of successes? What is n?

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percentage may be now, so a of 250 of last year's freshmen
4. 78% of all to in Fall 2015. You think that the
a
and tind that 84% returned, www.csun.edu/counts/one_year_continuation_rate-plip
a. What is p? _
What is the number of successes?
What is n?
b. Write the hypotheses:
Circle the best definition of p.
the proportion of all of last year's freshmen who returned
the proportion of all 2014 CSUN freshmen who returned
the proportion of all CSUN freshmen among the 250 who returned
C. Assuming that Ho is true, the sampling distribution of p has a mean of
Use the formula to compute the SE of the sampling distribution of p.
Complete this sketch of the sampling
distribution of p. Put a scale on the
horizontal axis. Then locate the result
from the sample and shade in area
representing the p-value. (Is the area
representing the p-value on one side
or two sides?)
Use StatCrunch to find the p-value for this situation.
e. Is there statistically significant evidence that the percentage is different now?
f. Complete each sentence.
Because the p-value is LESS / GREATER than 0.05, we REJECT/DO NOT REJECT the
NULL / ALTERNATIVE hypothesis. (The result IS / IS NOT significant at the 1% level.)
The data ARE / ARE NOT consistent with the claim that 78% of all of
FALL 2014 FRESHMEN / LAST YEAR'S FRESHMEN returned the following year.
If the null hypothesis is TRUE / FALSE, it is UNLIKELY / REASONABLY LIKELY to get a
random sample of 250 freshmen where 78% / 84% returned,
a. The proportion of all of last year's freshmen who returned actually was 81.2%. Did you
come to the right conclusion?
Explain.
7/18/20
Transcribed Image Text:percentage may be now, so a of 250 of last year's freshmen 4. 78% of all to in Fall 2015. You think that the a and tind that 84% returned, www.csun.edu/counts/one_year_continuation_rate-plip a. What is p? _ What is the number of successes? What is n? b. Write the hypotheses: Circle the best definition of p. the proportion of all of last year's freshmen who returned the proportion of all 2014 CSUN freshmen who returned the proportion of all CSUN freshmen among the 250 who returned C. Assuming that Ho is true, the sampling distribution of p has a mean of Use the formula to compute the SE of the sampling distribution of p. Complete this sketch of the sampling distribution of p. Put a scale on the horizontal axis. Then locate the result from the sample and shade in area representing the p-value. (Is the area representing the p-value on one side or two sides?) Use StatCrunch to find the p-value for this situation. e. Is there statistically significant evidence that the percentage is different now? f. Complete each sentence. Because the p-value is LESS / GREATER than 0.05, we REJECT/DO NOT REJECT the NULL / ALTERNATIVE hypothesis. (The result IS / IS NOT significant at the 1% level.) The data ARE / ARE NOT consistent with the claim that 78% of all of FALL 2014 FRESHMEN / LAST YEAR'S FRESHMEN returned the following year. If the null hypothesis is TRUE / FALSE, it is UNLIKELY / REASONABLY LIKELY to get a random sample of 250 freshmen where 78% / 84% returned, a. The proportion of all of last year's freshmen who returned actually was 81.2%. Did you come to the right conclusion? Explain. 7/18/20
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