A sample of 10 cognitive test scores which we can refer to as the variable X are as follows 98 88 97 118 103 98 99 106 86 107 1 1 point What is the mean of X 2 3 points What is the standard deviation of X 3 3 points What is the estimated standard error for the sample mean of X 4 10 points Using these data for X compute a 95 t confidence interval for a what is the degrees of freedom b what is the critical value c what is the margin of error d what is the lower confidence limit e what is the upper confidence limit 5 8 points Using these data for X do a two tailed hypothesis test of the null hypothesis that 105 Use 05 a write out the formal statements of the null and alternative hypotheses b what is the critical value c what is the value of the calculated test statistic d what is the conclusion of the hypothesis test
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