TABLE CD-3: Recent TikTok Posts by User
Post #	User	Seconds
1001	A. Franklin	9.2
1002	B. Holiday	10.9
1003	Brak Brak	9.8
1004	TomDog100	10
1005	M. Jackson	9.1
1006	Orijen	8.7
1007	M. Adonna	9.9
1008	TonyBark	9.3
1009	R. Charles	10.4
1010	Banfield	9.1
1011	R. Stewart	10.9
1012	M. Blige	9.5
1013	MickeyCat	8.8
1014	BarkKent	9.9
1015	Petsmart	10.4
1016	S. Nicks	10
1017	M. Carey	9.9
1018	LilWagsy	9.5
1019	Purina	9.7
1020	A. Cooper	11.3
1021	KeekeeVeach	10.5
1022	Green Pets	9.1
1023	F. Mercury	10.3
1024	A. Keys	9.3
1025	Mammoth	8.7
1026	Kong	9.9
1027	T. Braxton	9.3
1028	K. Clarkson	10
1029	D. Bowie	10
1030	RoverRover825	9.9
1031	MarkMindyJep	10
1032	Nutro	10.4
1033	Pedigree	10
1034	B. Spears	10.5
1035	R. Martin	10.4
1036	A. Rose	9
1037	J. Lopez	9.4
1038	WonderWaggin	10
1039	Woof Yoga	9
1040	B. Joel	10
1041	C. Dion	10.6
1042	Petmate	10
1043	Tiki Cat	10
1044	H. Lewis	10
1045	Sploof6297	10
1046	J. Page	9.6
1047	R. Plant	10.8
1048	BuzzBirdFeed	10.5
1049	Science Diet	9.2
1050	Blue Buffalo	9.3
1051	JagerDogzz	10
1052	G. Estefan	10
1053	Rescue-Biggs	10
1054	HeftyCatJack	9
1055	PetGuard	10
1056	J. Brown	11
1057	E. Clapton	10
1058	Petco	9
1059	Cat_Luv_U_3000	10
1060	Kit-n-Kat-n	10
1061	Jolly Pets	9.4
1062	E. John	10.5
1063	T. Swift	11.2
1064	Frontline	10
1065	Tabby Chic	10
1066	Shedding-4-U	9.6
1067	SmileyCuteyKitty	10
1068	L. Armstrong	11
1069	M. Davis	9
1070	Royal Canin	10.7
1071	Casper-the-Goat	10.6
1072	J. Mitchell	11
1073	Diamond	10
1074	Hello Kitty	10.7
1075	Tai-ke-ai	10
1076	Littermaid	10
1077	J. Hendrix	9.9
1078	K. Perry	10.4
1079	MSD	10.7
1080	Meow-of-this-World	10
1081	NaturVet	10.1
1082	T. Turner	9.2
1083	E. Fitzgerald	10.3
1084	ZoZo-Go	9.6
1085	W. Houston	9
1086	WinkMax7	10.6
1087	G. Michael	9.8
1088	D. Ross	11.3
1089	HappyPet	10.5
1090	K. West	10.6
1091	GroovyJax	10
1092	ZZ-Dogzz	8
1093	C. Simon	11
1094	C. Khan	9
1095	GruffyScruffy	8.6
1096	G. Stefani	10
1097	J. Jackson	8.3
1098	FuzzyWuzzy	10
1099	NoZoos	10.4
1100	Hill's	8.6

Assuming DCD has decided to expand onto TikTok, giving its regular users a chance to post short videos of their pets being, well, derpy. When DCD launched this new activity, they told users that they wanted all videos to be about 10 seconds long.

Looking at the data in Table C5-3 representing all 100 TikTok videos posted so far by DCD users, can DCD say with 95% confidence that the mean length of TikTok videos is between 9.8 and 10.2 seconds? In other words, find the 95% confidence intervals using the standard deviation from the data in Table C5-3.

Can DCD say with 99% confidence that the mean length of videos is between 9.8 and 10.2 seconds?