Paper 7 October/November 2003 MATHEMATICH (9709/7) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

In a random sample of 70 bars of Luxcleanse soap, 18 were found to be undersized.
a) Calculate an approximate 90% confidence interval for the proportion of all bars of Luxcleanse soap that are undersized.
b) Give a reason why your interval is only approximate.