# Answer in Statistics and Probability for zaqwan #269022

A study was carried out to estimate the mean height in cm of 15 years old students in SMK Jeli. A random sample of 100 students was selected. Previous studies indicate that the population variance of the height of such students is 80cm. Suppose the sample mean height was 145cm. Find a 95% confidence interval for the mean height of all 15 years old students in the school

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Answer in Statistics and Probability for zaqwan #269022
Just from $13/Page Confidence formula is written as: “CI=(\bar{X}- Z\times\frac{\sigma}{\sqrt{n}})to(\bar{X}+ Z\times\frac{\sigma}{\sqrt{n}})” Where; Z value at 95% confidence interval = 1.96 σ (population deviation) = Square root of population variance = Square root of 80 = 8.94 n = 100 X-bar = 145 So, a 95% confidence interval for the mean height of all 15 years old students in the school is: “CI=(145- 1.96\times\frac{8.94}{\sqrt{100}})to(145+ 1.96\times\frac{8.94}{\sqrt{100}})” “CI=(145- 1.75)to(145+ 1.75)” 95% CI = (143.25, 146.75) # What Will You Get? We provide professional writing services to help you score straight A’s by submitting custom written assignments that mirror your guidelines. #### Premium Quality Get result-oriented writing and never worry about grades anymore. We follow the highest quality standards to make sure that you get perfect assignments. #### Experienced Writers Our writers have experience in dealing with papers of every educational level. You can surely rely on the expertise of our qualified professionals. #### On-Time Delivery Your deadline is our threshold for success and we take it very seriously. We make sure you receive your papers before your predefined time. #### 24/7 Customer Support Someone from our customer support team is always here to respond to your questions. So, hit us up if you have got any ambiguity or concern. #### Complete Confidentiality Sit back and relax while we help you out with writing your papers. We have an ultimate policy for keeping your personal and order-related details a secret. #### Authentic Sources We assure you that your document will be thoroughly checked for plagiarism and grammatical errors as we use highly authentic and licit sources. #### Moneyback Guarantee Still reluctant about placing an order? Our 100% Moneyback Guarantee backs you up on rare occasions where you aren’t satisfied with the writing. #### Order Tracking You don’t have to wait for an update for hours; you can track the progress of your order any time you want. We share the status after each step. #### Areas of Expertise Although you can leverage our expertise for any writing task, we have a knack for creating flawless papers for the following document types. # Trusted Partner of 9650+ Students for Writing From brainstorming your paper's outline to perfecting its grammar, we perform every step carefully to make your paper worthy of A grade. ##### Preferred Writer Hire your preferred writer anytime. Simply specify if you want your preferred expert to write your paper and we’ll make that happen. ##### Grammar Check Report Get an elaborate and authentic grammar check report with your work to have the grammar goodness sealed in your document. ##### One Page Summary You can purchase this feature if you want our writers to sum up your paper in the form of a concise and well-articulated summary. ##### Plagiarism Report You don’t have to worry about plagiarism anymore. Get a plagiarism report to certify the uniqueness of your work. ## Free Features$66FREE

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