## Question

###### T-distribution with k degrees of freedom? Which of the following statements (are) true about the_ Thc t distribution symmetric aroundthe mean Iler variance (spread) than the t-distribution with k+1 degrees of Tne t distribution with degrees of freedom has freedom. The t-distribution has (spread) than the standard norma distribution: larger varianceI onlyb) IlonlyIIl onlyand IIandIIIBenera now does quadrupling the samp size affect the width of the confidence interval? The width of the interval be

t-distribution with k degrees of freedom? Which of the following statements (are) true about the_ Thc t distribution symmetric aroundthe mean Iler variance (spread) than the t-distribution with k+1 degrees of Tne t distribution with degrees of freedom has freedom. The t-distribution has (spread) than the standard norma distribution: larger variance I only b) Ilonly IIl only and II andIII Benera now does quadrupling the samp size affect the width of the confidence interval? The width of the interval becomes four times as large: The width of the interval becomes two times as large: The width of the intervae bccomc half _ arge_ d) The width of the interva becomes one-quarter as Jarge . We need t0 know the sample size be ablc to determine the cffcct: The 90% confidence interval for the population mean length frog jumps cm to 14.4cm, Which of the following statement correct interpretation of the confidence interval? Of thc total number in random sampb frogs, 90% of them can jump between 12.6cm t0 14.4 cm. There" 90% charce that any particular frog catch can jump between 12.6 cm to 14.4 cm: were repeat this sampling many times, 90% of the confidence intervals constructed in the same Manner would contain the true population mean: 90% of the confidence Intervals we construct after repeated sampling would be from 12.6 cm to 14.4 None cm: of the above: Part ? _ Written Questions According to Newsweck magazine, the number of hours per year spent kids front of screen (including television, comnuter smartphcne, etc) can be modeled by narma distribution with mcune 1500 houls 230 hours: standard deviation of What percent of kids spend more than 1850 nours per Year (this roughly foro than haurs screen? per dav) in front of & If 2 motner claims her child spent less than OCO hours front = Explain vour answer briefly. screen last year; would You believe this mother? Page 120i 4