2013 A-level H1 Mathematics (8864) Question 7 Suggested Solutions

All solutions here are SUGGESTED. Mr. Teng will hold no liability for any errors. Comments are entirely personal opinions.

Unbiased estimate of mean = \frac{305}{250} + 75 =  76.22

Unbiased estimate of variance = \frac{1}{249} (29555 - \frac{306^{2}}{250}) = 117

H_0: \mu = 75

H_1: \mu > 75

Under H_0, \bar{X} ~\sim~ \mathrm{N} (75 \frac{117.2004}{250}).

From graphing calculator, p-value = 0.0374 > 0.025, we do not reject H_0.

Thus, there is insufficient evidence at 2.5% level of significance that this type of device can retain information for more than 75 hours.

KS Comments

This question is fairly manageable.

Comments
    pingbacks / trackbacks

    Leave a Comment

    Contact Us

    CONTACT US We would love to hear from you. Contact us, or simply hit our personal page for more contact information

    Not readable? Change text. captcha txt

    Start typing and press Enter to search