4. 5. A sample of 26 Chips Ahoy regular cookies is taken by a Nabisco quality control manager, and it is found that the mean number of chocolate chips per cookie is 20.39. Nabisco knows that the standard deviation, o, is 2.55 for these cookies. Use your calculator to build a 98% confidence interval for the real mean number of chocolate chips per cookie. Then write a sentence or two that interprets your confidence interval. A researcher is collecting data about the SEC (Southeastern Conference) and its student-athletes. If the researcher wants to estimate the mean number of hours spent on required athletic activities by all student-athletes in the conference, then how many student-athletes must be included in the sample to be 98% confident that the sample mean is within 0.4 hour of the population mean? Assume the population standard deviation (o) is 2.41. Use the formula and show all work.

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4.
5.
A sample of 26 Chips Ahoy regular cookies is taken by a Nabisco quality control
manager, and it is found that the mean number of chocolate chips per cookie is 20.39.
Nabisco knows that the standard deviation, o, is 2.55 for these cookies.
Use your calculator to build a 98% confidence interval for the real mean number of
chocolate chips per cookie. Then write a sentence or two that interprets your
confidence interval.
A researcher is collecting data about the SEC (Southeastern Conference) and its
student-athletes. If the researcher wants to estimate the mean number of hours
spent on required athletic activities by all student-athletes in the conference, then
how many student-athletes must be included in the sample to be 98% confident
that the sample mean is within 0.4 hour of the population mean? Assume the
population standard deviation (o) is 2.41. Use the formula and show all work.
5.
Transcribed Image Text:4. 5. A sample of 26 Chips Ahoy regular cookies is taken by a Nabisco quality control manager, and it is found that the mean number of chocolate chips per cookie is 20.39. Nabisco knows that the standard deviation, o, is 2.55 for these cookies. Use your calculator to build a 98% confidence interval for the real mean number of chocolate chips per cookie. Then write a sentence or two that interprets your confidence interval. A researcher is collecting data about the SEC (Southeastern Conference) and its student-athletes. If the researcher wants to estimate the mean number of hours spent on required athletic activities by all student-athletes in the conference, then how many student-athletes must be included in the sample to be 98% confident that the sample mean is within 0.4 hour of the population mean? Assume the population standard deviation (o) is 2.41. Use the formula and show all work. 5.
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